APF Mark 31 Handheld Electronic Calculator
date: label: date made
content: ca 1976
name: label: maker
content: APF Electronics
notes: label: Description
content: This handheld electronic calculator has an array of ten brown plastic keys for digits and a decimal point. Above these are inversion, squaring, and square root keys. To the immediate left is an x/y exchange key, a percentage key, keys for the four arithmetic operations, and an equals/constant key. Left of these is a clear entry/clear key and a set of five memory keys. A mark above the switch reads: aPF MARK 31.
label: Description
content: Behind the keyboard is an eight-digit display.
label: Description
content: The back of the calculator has a compartment for a battery but no battery or compartment cover. A silver-colored sticker pasted to the back reads: aPF mark 31 (/) SLIDE RULE CALCULATOR. It gives operating instructions. The bottom of this label reads: MARK 31 (/) Model No. It also reads: MT-019962 (/) Serial No. Further text reads: APF ELECTRONICS INC. (/) NEW YORK, N.Y. 10022 (/) MADE IN JAPAN. A mark in the bottom left corner reads: 7545. The top edge of the calculator has a hole for an adapter but no adapter.
label: Description
content: An August 1976 advertisement in the <I>Los Angeles Times</I> lists the APF Mark 31 as on sale for $19.99. An October 1976 advertisement in <I>The Chicago Tribune</I> gives a regular price of $14.95 and a sale price of $13.99. An ad in the <I>Los Angeles Times</I> the same time gives the same prices.
label: Description
content: Compare 1986.0988.083 (the Montgomery Ward P203).
label: Description
content: References:
label: Description
content: <I>Los Angeles Times</I>, August 25, 1976, p. 11.
label: Description
content: <I>Los Angeles Times</I>, October 17, 1976, p. M20.
label: Description
content: <I>Chicago Tribune</I>, October 17, 1976, p. 40.
label: Location
content: Currently not on view
place: label: place made
content: Japan
setName: label: See more items in
content: Medicine and Science: Computers
label: See more items in
content: Computers & Business Machines
label: See more items in
content: Handheld Electronic Calculators
creditLine: label: Credit Line
content: Gift of John B. Priser
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.0988.168
label: catalog number
content: 1986.0988.168
label: accession number
content: 1986.0988
objectType: label: Object Name
content: electronic calculator
label: Other Terms
content: electronic calculator; Handheld
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: paper (sticker material)
label: Physical Description
content: rubber (feet material)
label: Physical Description
content: metal (circuits material)
label: Measurements
content: overall: 1 in x 3 in x 5 3/4 in; 2.54 cm x 7.62 cm x 14.605 cm