Question: Were both Grundy NewBrain and Wave Mate Bullet around in the 1970's?

Context paragraphs:
Ideal mate: In chess, an ideal mate is a checkmate position that is a special form of model mate.  While in a model mate, each piece on the mating player's side (possibly excluding the king and pawns depending on context) participates in the mate, an ideal mate involves all the pieces of the mated player's as well, typically by blocking the mated king's field of movement so that it cannot escape.  As in a model mate, an ideal mate also involves the mating pieces attacking the vacant squares around the mated king's exactly once, and not attacking the mated player's other pieces occupying the king's field of movement.

Wave Mate Bullet: The Wave Mate Bullet was a Z80 single-board computer from the late 1970s and early 1980s which used the CP/M operating system.  This computer is rarely seen now but has historical value as an early microcomputer pioneer.  It was sold in Australia, the United States and Europe and was apparently popular in academic settings.

Single Bullet Theory (metal band): Single Bullet Theory (SBT) is an American heavy metal band from Philadelphia, Pennsylvania.  They are not to be confused with the new wave band called Single Bullet Theory who disbanded in 1984.  Single Bullet Theory was founded in 2000 by guitarist Matt DiFabio after the disbanding of Cipher (active again as of Dec. 2015).  The band's current lineup consists of vocalist/guitarist Matt DiFabio (ex-Pissing Razors), bassist Bill Mez (ex-Seven Witches), guitarist Rich Gulczynski (Solace of Requiem), and drummer Rob Gladden.  The band has released two EP's, four full-length studio albums, and one compilation album to date.  The band is scheduled to release its fifth full-length studio album "Divine Ways of Chaos" in 2016.

Bob Seger: Robert Clark Seger ( , born May 6, 1945) is an American singer-songwriter, guitarist and pianist.  As a locally successful Detroit-area artist, he performed and recorded as Bob Seger and the Last Heard and Bob Seger System throughout the 1960s.  By the early 1970s, he had dropped the 'System' from his recordings and continued to strive for broader success with various other bands.  In 1973, he put together the Silver Bullet Band, with a group of Detroit-area musicians, with whom he became most successful on the national level with the album "Live Bullet" (1976), recorded live with the Silver Bullet Band in 1975 at Cobo Hall in Detroit, Michigan.  In 1976, he achieved a national breakout with the studio album "Night Moves".  On his studio albums, he also worked extensively with the Alabama-based Muscle Shoals Rhythm Section, which appeared on several of Seger's best-selling singles and albums.

.22 Winchester Magnum Rimfire: The .22 Winchester Magnum Rimfire (5.6×27mmR), more commonly called .22 WMR, .22 Magnum, or simply .22 Mag, is a rimfire cartridge.  Originally loaded with a bullet weight of 40 gr delivering velocities in the 2000 ft/s range from a rifle barrel, .22 WMR has also been loaded with bullet weights of 50 gr at 1750 ft/s and 30 gr at 2250 ft/s .  More recently, a high-quality 30gr Vmax cartridge from Hornady has been released.  This exceeds 2200fps in a rifle and has a reputation for much greater consistency and accuracy than was previously attributed to this calibre.  Accuracy around 1 MOA is achievable and this has led to this cartridge regaining ground previously lost to the excellent .17 HMR, especially as the 30gr bullet weight (nearly double that of the HMR's normal 17gr) gives it a reputation for hitting harder on larger varmints such as fox and coyote.

Carabine à tige: The carabine à tige (sometimes called a "stem rifle") was a type of black-powder, muzzle-loading rifle invented by Louis-Etienne de Thouvenin.  The method was an improvement of the invention of another Frenchman, Henri-Gustave Delvigne.  Delvigne had developed chambered carbines and rampart rifle-muskets so that when forced against the chamber rim by ramming (with three strokes of a heavy ram), the bullet would become deformed and flatten, so as to expand in diameter against the inside of the bore, allowing the bullet to press against the rifling grooves.  When fired, the bullet accompanied the rifling and spun.  This was an early attempt to work around one of the greatest hindrances to the use of military rifles; in order for a rifle to impart the proper spin to a projectile, the projectile must fit snugly inside the barrel to engage the rifling grooves.  However, with the universally-used black powder of the day, weapons would quickly build up a thick layer of fouling when fired.  After only three or four shot, a typical rifle would be impossible to load without using a mallet to force the bullet down the fouled barrel.  Designing a projectile that was smaller than the bore of the barrel, to allow easy loading, but which could then be expanded to fit snugly into the bore before firing would allow for the accuracy of rifles, but without the very slow and painstaking reloading procedure necessitated by the heavy fouling.

.17 Remington Fireball: The .17 Remington Fireball was created in 2007 by Remington Arms Company as a response to the popular wildcat round, the .17 Mach IV.  Factory loads drive a 20 grain (1.3 g) bullet around 4,000 ft/s (1,219 m/s).  Velocity is close to the .17 Remington but with significantly less powder, and therefore less heat and fouling.  Both are important issues to high-volume shooters such as varmint hunters.

Sabot: A sabot (UK and Int.: , ), (US: ) is a structural device used in firearm or cannon ammunition to keep a sub-caliber flight projectile, such as a relatively small bullet or arrow-type projectile, in the center of the barrel when fired, if the bullet has a significantly smaller diameter than the bore diameter of the weapon used.  The sabot component in projectile design is more than simply the relatively thin, tough and deformable seal known as a driving band or obturation ring needed to trap propellant gases behind a projectile, and also keep the projectile centered in the barrel, when the outer shell of the projectile is only slightly smaller in diameter than the caliber of the barrel.  Driving bands and obturators are used to seal these full-bore projectiles in the barrel because of manufacturing tolerances; there always exists some gap between the projectile outer diameter and the barrel inner diameter, usually a few thousandths of an inch; enough of a gap for high pressure gasses to slip by during firing.  Driving bands and obturator rings are made from material that will deform and seal the barrel as the projectile is forced from the chamber into the barrel.  Small caliber jacketed bullets do not normally employ driving bands or obturators because the jacket material, for example copper or gilding metal, is deformable enough to serve that function, and the bullet is made slightly larger than the barrel for that purpose, (see Full metal jacket bullet and driving band).  Sabots certainly use driving bands and obturators, because the same manufacturing tolerance issues exist when sealing the saboted projectile in the barrel, but the sabot itself is a more substantial structural component of the in-bore projectile configuration (Drysdale 1978).  Refer to the two APFSDS (Armor Piercing Fin Stabilized Discarding Sabot) pictures on the right to see the substantial material nature of a sabot to fill the bore diameter around the sub-caliber arrow-type flight projectile, compared to the very small gap sealed by a driving band or obturator to mitigate what is known classically as windage.  More detailed cutaways of the internal structural complexity of advanced APFSDS saboted long rod penetrator projectiles can be found at reference 2.

4.6×36 mm: The 4.6×36 mm is a cartridge developed by Heckler & Koch for its experimental HK36 assault rifle of the 1970s.  When the rifle was not taken into service by any military force, its ammunition was not used for any other weapon design.  The main feature that set the bullet apart from its contemporaries was the use of a so-called "spoon tip" (German: "Löffelspitz"): the tip had a concave area on one side which was intended to make the bullet "tumble" after hitting a target, in order to give it greater stopping power than such a small, high-velocity bullet would otherwise have.

Grundy NewBrain: The Grundy NewBrain was a microcomputer sold in the early 1980s by Grundy Business Systems Ltd of Teddington and Cambridge, England.

Supporting paragraphs: Grundy NewBrain Wave Mate Bullet
Answer: no