baber/WOPTO huggingface dataset:
Patent GB-1516458-A (GB)
Title: Microorganisms and method of preparing and using same
IPC: C12P1/00
Filed: 1976-09-30
Abstract: 1516458 Genetically modified microorganisms RESEARCH CORP 30 Sept 1976 [27 Sept 1976] 40664/76 Heading C6F Microorganisms have been developed having the following characteristics: (a) the microorganism is capable of having recombinant DNA or other foreign genetic information introduced thereinto and recovered therefrom along with its expression with production of useful gene products; (b) the microorganism is dependent for growth and survival upon defined conditions; (c) the microorganism is incapable of establishment or growth or colonization and/or survival under conditions or in ecological niches that are non-permissive for said microorganism; (d) the microorganism is capable of causing DNA or other foreign genetic information incorporated therein to undergo degradation under conditions or in ecological niches that are non- permissive for said microorganism; (e) the microorganism is capable of permitting cloning vectors incorporated therein to be dependent for their replication, maintenance and/or function on said microorganism; (f) the microorganism is substantially incapable of transmitting cloning vectors or recombinant DNA or other foreign genetic information incorporated therein to other organisms under non-permissive conditions for said microorganism; (g) the microorganism is capable of being monitored by suitable means and/or techniques without substantial alteration of said microorganism; and (h) the microorganism is susceptible of substantially minimal contamination with other organisms when recombinant DNA or other foreign genetic information is incorporated therein and being substantially incapable of contaminating other organisms when incorporated therein or consumed thereby when recombinant DNA or other foreign genetic information is present in said microorganism. The preparation by mutation techniques and the properties of a particularly preferred strain fully conforming to the definition given above viz. Escherichia coli K-12 X 1776 (ATCC No. 31244) and of many other useful strains of the species are discussed in considerable detail. A method for the transformation of a strain of E. coli for the introduction thereinto of recombinant DNA molecules is described. Other species of bacteria and yeasts are particularly mentioned.
Patent GB-1472650-A (GB)
Title: Inhalator for pulverulent substances
IPC: A61M13/00
Filed: 1974-09-18
Abstract: 1472650 Pocket inhalers PAUL RITZAU PARI WERK KG 18 Sept 1974 [18 Sept 1973] 40719/74 Heading A5T A pocket inhaler comprises a cylindrical case 2, Fig. 4, having a mouthpiece 17, Fig. 1, and air entry slots (not shown), a reception space 1 in the outer periphery of the case for receiving a capsule 11 of powder, and a transparent cover 3 rotatably mounted on the case and having an aperture 4 therein, which aperture may be brought over the space 1 to permit removal and replacement of a capsule or which cover may be rotated so as to enclose the capsule in said space. A stop pin 6 in the case engages in a notch 8 of the cover to immobilise the cover when the capsule is uncovered. The pin is rigidly coupled to an ejector 10 displaceably arranged in the case and constantly urged to eject the capsule by a spring 9. Two blades 12 mounted in the cover are movable therewith in order to pierce a capsule in the reception space. The cover comprises a cylindrical sleeve and is automatically moved to the capsule-enclosed position after insertion of a capsule and displacement of the ejector together with the stop pin, by a coil spring 16 in the base of the sleeve. The cover may alternatively comprise a closed slide movable axially of the case or it may comprise a lid which is secured by hinges.
Patent GB-955378-A (GB)
Title: Improvements in or relating to motor vehicle hydraulic driving transmissions
IPC: B60K17/10
Filed: 1962-10-29
Abstract: 955,378. Hydraulic transmission of power. RICHIER S.A. Oct. 29, 1962 [Oct. 31, 1961], No. 40732/62. Heading F2C. [Also in Division B7] A motor vehicle hydraulic driving arrangement comprises a pump P driven by a motor A supplying in a parallel arrangement through a distributer B and control valves C 1 , C 2 , C 3  and C 4 ' motors M 1 ,. M 2 , M 3  and M 4  drivingly connected respectively to the wheels R 1 , R 2 , R 3  and R 4 . A reversing device I is associated with the distributer and valves V 1 , V 2  and V 3  are provided for operating the distributer for braking and reversing operations and a valve V 4  controls the valves C 1 , C 2 , C 3  and C 4  through pilot lines a 1 , a 2 , a 3  and a 4 . The motors M 1 -M 4  are drivingly connected respectively with pumps P 1 -p 4  which are in a closed circuit b with downstream connections to a reservoir through non-return valves Cr 1 - Cr 4  and safety valves Cs 1 -Cs 4  and tappings b 1 -b 4  to the pilot lines controlling valves C 1 -C 4 . Should a motor race, e.g. motor M 3 , its associated pump p 3  will draw fluid from the reservoir through valve Cr 2  and the increase in pressure on the downstream side will act through line b 3  to operate the control valve C 3  and disconnect the supply of pressure fluid to the motor M 3 . When the motor M 3  stops, the pump p 3  stops diminishing the pressure in the line b 3  whereupon the valve C 3  is again operated to restore the supply of pressure fluid to the motor M 3 . An interdependence of the wheeloperating conditions is provided by suitable calibration of the valves Cs 3 -Cs 4 .
Patent GB-1281865-A (GB)
Title: Building set for the sheeting of service ditches
Inventor: KRINGS JOSEF
IPC: E02D17/08
Filed: 1970-08-25
Abstract: 1281865 Shores for trenches J KRINGS 25 Aug 1970 [8 Nov 1969] 40793/70 Heading E1E A shore for a trench comprises wallings 1 located in position by piles 2 each provided with a channel portion 6 to slidably receive shoe means 7, 7'. The opposed shoe means are adjustably spaced apart by a turn buckle device 8, having pegs 17 to receive a suitable tool.
Patent GB-1272445-A (GB)
Title: Machine for continuously treating vulcanized fibre
Inventor: HERRING JAMES MORTON JR
IPC: B05C3/12
Filed: 1969-08-15
Abstract: 1,272,445. Treating webs with liquids. BUDD CO. 15 Aug., 1969 [29 Aug., 1968], No. 40893/69. Heading D1L. Apparatus for liquid-treating a horizontally travelling continuous web of which the plane is disposed vertically comprises a tank holding the liquid, vertical walls within the tank forming relatively narrow passages through which the web is passed, means for holding the web in the said disposition and means for advancing the web horizontally. The holding means may be grippers which travel on an overhead rail above the tank and advancement may be achieved by driven rollers in the bath over which the web passes. As disclosed, the web may travel in a rectangular bath being directed at each deflection nearer to the centre of the bath where the web is removed or wound up; or the web may travel in a spiral shaped bath; or it may follow a sinuous path. The washing of "vulcanized fibre" which may be a ZnCl 2 - hydrolysed cellulosic sheet is disclosed. Means may be provided for deflecting the plane of such a sheet from the horizontal to the vertical before and after the washing bath.
Patent GB-1183460-A (GB)
Title: Improvements in and relating to a Regulating-Lever Mounting for a Watch Hair-Spring
Inventor: BARBIER PIERRE JOSEPH
IPC: G04B18/02
Filed: 1968-08-27
Abstract: 1,183,460. Watches. ETABS. ED. JAEGER S.A. Aug. 27, 1968 [Dec. 20, 1967], No.40974/68. Heading G3T. A regulating lever mounting for a watch hair spring 4 comprises a pin 5 retained in fixed spaced relationship with at least a portion of a spigot S, the width of the space between the pin and spigot varying in a direction along the length of the pin to permit insertion in a portion of space of smaller width and then clamping, of the hair spring between the pin and spigot by sliding the hair spring after insertion in said direction.
Patent GB-1487830-A (GB)
Title: Process for absorbing sulphur trioxide from gases containing it
IPC: B01D53/50
Filed: 1974-09-20
Abstract: 1487830 Preparation of conc sulphuric acid; SO 3  absorption METALLGESELLSCHAFT AG 20 Sept 1974 [25 Sept 1973] 41182/74 Heading ClA Sulphur trioxide (which may conveniently be prepared by the contact process) is absorbed from a gas by passing through a Venturi tube absorber in co-current with a spray of sulphuric acid, wherein part of the resulting heat is removed by indirect heat exchange with a cooling fluid, the cooling elements being situated in the flared part of the Venturi tube or immediately subsequent thereto in the direction of flow. The cooling fluid is preferably boilerfeed water. Concentrated sulphuric acid is recovered.
Patent GB-1431246-A (GB)
Title: Toy vehicle
IPC: A63H17/12
Filed: 1974-09-25
Abstract: 1431246 Toy bulldozers TONKA CORP 25 Sept 1974 [30 Jan 1974] 41757/74 Heading A6S A toy bulldozer having a chassis 10 with a transverse blade 17 mounted by an arm 18 at each end on a pivot pin 20, has a handle 24 to tilt the blade provided with at least one leg 26 slidable through a simulated cylinder 22. In the -preferred embodiment, there is a handle leg 26 and a simulated cylinder 22 at each side of the toy bulldozer. The simulated cylinders 22 each have a longitudinal slit 32 down their undersides; and pivot on a cross pin 36. Latching protrusions 29, 30 on each handle leg 26 coact with the respective ends of the cylinder pivot pin 36 to retain the bulldozer blade 17 in a partly or fully raised position when the handle 24 is pulled to slide its leg 26 through the simulated cylinders 22.
Patent GB-1434694-A (GB)
Title: Nonapeptide amides
IPC: A61K38/00
Filed: 1974-09-26
Abstract: 1434694 Nonapeptide amides TAKEDA YAKUHIN KOGYO KK 26 Sept 1974 [29 Sept 1973 8 March 1974] 41882/74 Heading C3H [Also in Division C2] Peptides of the Formula (I) wherein R 1  is Tyr or Phe; R 2  is D-heu, D-Ile, D-Nle, DKVal, D-Nva, D-Abu, α-Aibu, D-Phe, D-Phg, D-Ser, D-Thr or D-Met; R 3  is Leu, Ile or Nle; and R 4  is alkyl or 1-3 carbon atoms which may be substituted by at least one hydroxy group may be prepared by the condensation of (A) L-pyroglutamic acid, a protected L-glutamic acid or a peptide fragment which has an L-pyroglutamic acid or protected L-glutamic acid as the N-terminus, and which has the partial structure of (I) with (B) an amine component which, taken with (A), corresponds to peptide (I), preferably at -20 to 30 C., wherein active groups not participating in peptide bond formation are optionally protected if necessary, converting the glutamyl to pyroglutamyl with acid or base and finally removing the protective groups if any. The process may be performed using solid state synthesis. In the examples, the following compounds are prepared. Other peptides prepared are:  NONAPEPTIDES: H - (Pyr)Glu - His - Trp- Ser - Tyr - D - Leu - Leu - Arg(NO 2 ) - Pro- NH.CH 2 CH 3 ; H - (PyrGlu) - His(Tos) - Trp- Ser(Bzl) - Tyr(Bzl) - D - Leu - Leu - Arg(Tos)- Pro-NH.CH 2 CH 3 . HEXAPEPTIDES: BOC - Ser - Tyr(Bzl) - α- Aibu-Leu-Arg(NO 2 )-Pro-NH.CH 2 CH 3 . PENTAPEPTIDES: BOC - Tyr(Bzl) - α- Aibu - Leu - Arg(NO 2 ) - Pro - NH.CH 2 CH 3 ; H- (Pyr)Glu-His-Trp-Ser-Phe-OH and OCH 3 . TETRAPEPTIDES: Z and H - D - Leu- Leu - Arg(NO 2 ) - Pro - NH-CH 2 CH 3 ; Z - α- Aibu - Leu - Arg(NO 2 ) - Pro - NH.CH 2 CH 3 ; ZD - Phg - Leu - Arg(NO 2 ) - Pro - NH.CH 2 CH 3 ; Z - D - Ser - Leu - Arg(NO 2 ) - Pro - NH.CH 2 CH 3 ; Z - D - Abu - Leu - Arg(NO 2 ) - Pro - NH. CH 2 CH 3 ; Z - D - Nva - Leu - Arg(NO 2 ) - Pro- NH.CH 2 CH 3 ; Z and H - D - Nva - Leu- Arg(NO 2 ) - Pro - NH.CH 2 CH 2 CH 3 ; Z - DAbu - Leu - Arg(NO 2 ) - Pro - NH.CH(CH 3 ) 2 ; BOC - D - Nle - Leu - Arg - (NO 2 ) - Pro - NH. CH 2 CH 3 ; H - D - Phe - Leu - Arg(NO 2 ) - Pro- NH.CH 2 CH 3 ; BOC - D - Thr - Leu - Arg(NO 2 )- Pro - NH.CH 2 CH 3 ; Z - D - Leu - Ile - Arg(NO 2 )- Pro - NH.CH 2 CH 3 ; Z - D - Leu - Nle - Arg(NO 2 )- Pro - NH.CH 2 CH 3 ; BOC - D - Val - Leu- Arg(NO 2 ) - Pro - NH.CH 2 CH 3 ; BOC - D - Met- Leu - Arg(NO 2 ) - Pro - NH.CH 2 CH 3 ; BOCD-Ile-Leu-Arg(NO 2 )-Pro-NH.CH 2 CH 3 . TRIPEPTIDES: Z - Ile - Arg(NO 2 ) - Pro- NH.CH 2 CH 3 ; Z - Nle - Arg(NO 2 ) - Pro- NH.CH 2 CH 3 . Peptides (I) may be recovered as salts (hydrochlorides, hydrobromides, perchlorides, nitrates, thiocyanates, sulphates, phosphates, formates, acetates, propionates, glycolates, lactates, pyruvates, oxalates, malonates, succinates, maleates, fumarates) or metal complexes (zinc (II), nickel (II), cobalt (II), copper (II), iron (II)). Pharmaceutical compositions comprise peptide (I) and a suitable carrier, preferably for non-oral administration and are used for the promotion of ovulation in female animals.
Patent GB-1519009-A (GB)
Title: Sheet delivery apparatus for printing machines
IPC: B65H31/32
Filed: 1975-10-14
Abstract: 1519009 Stacking sheets HEIDELBERGER DRUCKMASCHINEN AG 14 Oct 1975 [7 May 1975] 42029/75 Heading B8R To facilitate introduction of auxiliary pile table 6 a sheet delivery apparatus is provided with front and rear sheet support members 15, 19 which are movable to a position over the stack to intercept delivered sheets. The support members are both supplied with suction air to aid gripping of the sheets. The front supports 15 are moved into position by a lever mechanism and the rear supports 19 by a piston and cylinder mechanism 20, 21.
Patent GB-1361504-A (GB)
Title: Method and apparatus for continuously preparing a gel
IPC: A62C5/02
Filed: 1971-09-10
Abstract: 1361504 Fire-fighting gels GELCO-PROJECT LINDREN & CO HANDELSBOLAG 10 Sept 1971 [14 Sept 1970] 42250/71 Heading A5A [Also in Division B1] A fire-fighting gel is prepared by supplying a gel-forming agent to liquid flowing in a conduit at such position and in such proporthat the gel is fully formed only at as near the point of use or discharge. The method is preferably carried out in more than one step. As shown water flowing in a conduit 4 passes through an inner coaxial conduit 5 and partly through a by-pass 9. Gel forming agent is supplied through an inlet 6 to the inner conduit 5 and mixes therein with the water, the mixture so formed being further diluted in the conduit 4 with the water from the by-pass. The proportion of gel-forming agent may be controlled by valves 8, 10 or gear pumps. Conduits 4, 5 may be flexible hoses. The gel forming agent may comprise a surface-active polyethylene oxide derivative which may comprise alkyl, aryl or naphthyl polyglycol ethers, and a volatile hydrocarbon heavy or light oil such as paraffin or white spirit. The surface active compound may be 10-70% of the gelling agent and the concentration of gelling agent in the final water gel 0.1-1.0% and preferably 2-4%.
Patent GB-935628-A (GB)
Title: Improvements relating to ships' windows
Inventor: OVENS WILLIAM
IPC: B63B19/00
Filed: 1960-12-08
Abstract: 935,628. Ships' windows. BULL'S METAL & MARINE Ltd. Nov. 22, 1961 [Dec. 8, 1960], No. 42314/60. Class 20 (3). [Also in Group XXV] The edges 37 of a glazed door 10 hinged upon the main frame 15 of a ship's window is shrouded by a continuous bead or flange 35 on the outboard side of the main frame. The flange 35 forms one side of a channel 32 containing a seal 33 for the door edges. The main frame has a spigot 24 shaped for extending inboard through an opening in the ship's plating. The door is releasably secured closed by a hook member 19 engaging over the edge portion 23 of the spigot 24 (see Group XXV). The light 38 is secured in the door 10 by a glazing frame 41.
Patent GB-1461892-A (GB)
Title: Photographic silver halide materials
IPC: G03C1/34
Filed: 1974-09-30
Abstract: 1461892 Photographic silver halide materials EASTMAN KODAK CO 30 Sept 1974 [1 Oct 1973] 42375/74 Heading G2C Photo-sensitive photographic material comprises a support bearing at least one silver halide emulsion layer containing from 10 to 1000 g per mole of silver halide of an azaindene and at least one layer containing 0À1 to 500 mg per square foot (expressed as cobalt) of a cobalt (III) complex ion. Many azaindenes are specified including pentazaindenes and tetrazaindenes such as 4-hydroxy- 6-alkyl-1,3,3a,7-tetrazaindenes. The complex cobalt ion may contain a wide variety of ligands including NH 3 , H 2 O, CO 3 , Cl, NCS, ethylene diamine and propylene diamine. The silver halide emulsion layer may also contain additional iodide ions provided by alkali-metal or ammonium iodide, mercuric iodide, a quaternary ammonium iodide or iodine complex thereof, or an organic sulphonium, phosphonium or iodonium iodide. The photographic materials are preferably colour materials containing colour couplers. The presence of the azaindene in the material reduces desensitization of the silver halide emulsion caused by the cobalt complex ions.
Patent GB-1270662-A (GB)
Title: Fluorocarbon surfactants
Inventor: FIELDING HAROLD CROSBIE
IPC: C11D1/00
Filed: 1969-04-15
Abstract: 1,270,662. Tetrafluoroethylene oligomer derivatives. IMPERIAL CHEMICAL INDUSTRIES Ltd. 15 April, 1969, No. 42536/71. Divided out of 1,250,661. Heading C2C. The invention comprises compounds of the formula wherein n is 4, 5 or 6 and Q is or -CH 2 -R, wherein L is H, CH 3  or C 2 H 5 , m is an integer from 1 to 6 and R is selected from wherein X, Y and Z which may be the same or different are methyl or ethyl groups and A is Cl, Br, I or CH 3 SO 4  or Q is wherein L and m are as hereinbefore specified and M is hydrogen, alkali-metal, ammonium or alkyl ammonium. Such compounds are prepared by reacting appropriate tetrafluoro ethylene oligomer substituted benzene sulphonic acids or acid chlorides with suitable aliphatic diamines and quaternizing the products. Alternatively appropriate tetrafluoroethylene oligomers are reacted with the methyl ester of sodium p-hydroxy benzoic acid, hydrolysing the product to the free acid and reacting the latter or the acid chloride with an appropriate compound containing an NH-group, e.g. a diamine, amino acid or lactone. In the case where a diamine is employed as starting material the intermediate is quaternized to obtain the desired product.
Patent GB-1463066-A (GB)
Title: Conveyor belt
IPC: B65G17/06
Filed: 1973-09-11
Abstract: 1463066 Endless conveyer belts UMECBOYDELL (BELTING) Ltd 22 Aug 1974 [11 Sept 1973] 42672/73 Heading B8A An endless conveyer belt has slats 3 supported by cross-rods 1 connected to driving chains 2. Each slat is formed from a metal blank shaped to provide two channels 8 engageable with a pair of adjacent rods 1. A stiffening web 7 has a plastics bead 11 for engagement with guides 12 at either side of the belt. Fig. 3 indicates how a slat 3 is able to move around the periphery of a rod 1. Two or more slats side-by-side may replace a single slat 1. The slats may be of plastics and in slab form, the recesses then being formed within the thickness of the slat. The rods may be coupled together directly by hooking into one another. The recesses need not be arcuate as shown; they may be part-elliptical, rectangular or triangular the cross rods then engaging the opposing edges only of the mouths of the recesses.
Patent GB-915521-A (GB)
Title: Device for holding a length of thread and a weaving loom provided with this device
IPC: D03D47/00
Filed: 1959-12-15
Abstract: 915,521. Weft measuring devices. MACHINENFABRIEK L. TE STRAKE N.V. Dec. 15, 1959 [Dec. 24, 1958], No. 42682/59. Class 142 (2). A jet-loom weft measuring device comprises a member 7 into which a loop of weft 5 is drawn by suction. Weft 5 is continuously fed by rollers 3, 4, past a suction member 14 and through clamps 10, 13 on either side of the suction member 7. In operation, and with the clamp 10 closed, weft is drawn into the member 7, clamp 10 is opened and clamp 13 closed whilst the jet 1 picks the weft drawn into the member 7. Whilst the clamp 13 is closed weft is temporarily drawn into the member 14. The member 7 may be replaced by two smaller members.
Patent GB-1236527-A (GB)
Title: Buckles
IPC: A44B11/25
Filed: 1969-08-27
Abstract: 1,236,527. Stud and socket fastenings; buckles. FIRESTONE TIRE & RUBBER CO. 27 Aug., 1969, No. 42687/69. Headings E2A and E2B. A buckle comprises two plate elements 15a 18a one element having two openings 16a, 17a joined by a constriction and the other element having a headed stud 20a with a spring 21a and spring grommet 27 surrounding the shank, the stud being inserted in the opening 16a and upon depressing the spring is slid into the opening 17a. One opening may be larger than the other or the spring may comprise a circular band. The head of the stud is bevelled to seat upon a bevelled edge of the opening or the head is stepped the smaller stepped portion being engageable in the smaller opening. A plate, Fig. 3 (not shown), may have a plurality of studs for retaining a plurality of apertured plates or a plate may have a plurality of openings for retaining a plurality of plates with studs. A plate with studs or openings may be combined with an apertured tongue, Fig. 15 (not shown), for securing in a buckle part, and a knurled cross bar for adjustably retaining an end portion of a belt.
Patent GB-1077968-A (GB)
Title: Motor vehicle suspension
Inventor: OLDFIELD JOHN ARTHUR
IPC: B60G11/04
Filed: 1965-10-12
Abstract: 1,077,968. Vehicle suspensions. FORD MOTOR CO. Ltd. Oct. 12, 1965, No. 43157/65. Heading B7D. [Also in Division F2] In a motor vehicle suspension a leaf spring 13, which is connected to an axle 11 and which is mounted on the sprung part 12 of the vehicle by two pivots 14, 15, is characterized in that it has adjacent one end a bend 17 such that, during deflection, the bend is stressed to alter the longitudinal stress in the main part of the spring and thus alter the spring rate. In a modification, Fig. 2 (not shown), the bend is in the form of an upwardly-directed loop. In a further modification, Fig. 3 (not shown), the end (17) consists of a return bend which is bolted at (18) directly on to the vehicle chassis.
Patent GB-1286484-A (GB)
Title: Improvements in or relating to fluid-flow control valves and sealing means therefor
Inventor: CAVE GORDON MILFORD
IPC: F16K3/02
Filed: 1969-08-30
Abstract: 1286484 Valves COPLASTIX Ltd 28 Aug 1970 [30 Aug 1969] 43273/69 Heading F2V A valve has two resilient sealing members 34 disposed at opposite sides of a closure member 28 slidable in a frame 22, the sealing members being compressed when the valve is closed. The frame is constructed of U-shaped channel members of cast iron or treated mild steel to which the members 34 are secured by an epoxybased adhesive. Each member consists of a resilient strip 36 of a closed-cell non-absorbent plastics or rubber foam material such as nitrile or neoprene rubber bonded to a bearing layer 38 of polypropylene or medium density high molecular weight polyethylene providing a low coefficient of friction with the closure member which may be of closed cell rigid polyvinyl chloride foam with an outer skin. A hand wheel 32 operates the closure member.
Patent GB-1348219-A (GB)
Title: Sequence control
IPC: G05B19/07
Filed: 1972-09-19
Abstract: 1348219 Control circuits for resistance welding apparatus BROOKHIRST IGRANIC Ltd 19 Sept 1972 [22 Sept 1971] 43292/72 Heading H2H [Also in Division H3] A sequence of welding operations is timed by comparing the output of a C-R timing circuit R1, R2, C1 during successive timing cycles with successive ones of a plurality of potentiometers connected across the supply for the timing circuit. The exponential charging curve enables linear potentiometers to be used to provide logarithmic control adjustment. As shown, equality of the voltage across a selected potentiometer with the voltage across the capacitor C1 allows the diode D to conduct and thus pulses from a saturating transformer T1 to pass to an amplifier A. Selection of the potentiometers is effected by transistors TR1-TR4 controlled by a shift register stepped by the output of the amplifier coincidentally with the discharge of the capacitor via TR5. A diode selecting circuit may replace the transistor (Fig. 4, not shown).