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Model M keyboards are a group of computer keyboards designed and manufactured by IBM starting in 1985, and later by Lexmark International, Maxi Switch, and Unicomp. The keyboard's different variations have their own distinct characteristics, with the vast majority having a buckling-spring key design and uniform profile, swappable keycaps. Model ...
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For signal pentodes, an odd model number most often identified a variable-mu (remote-cutoff) tube, whereas an even number identified a 'high slope' (sharp-cutoff) tube For power pentodes and triode-pentode combinations, even numbers usually indicate linear (audio power amplifier) devices while odd numbers were more suited to video signals or ...
he Model M was designed to be a more cost effective keyboard than the Model F keyboards it replaced. Production for the original Model M began in 1984, and the keyboards were often bundled with new IBM computers in the 1980s. The earliest example currently known is a 102 Key Terminal Model M (1386304) dated 10 June 1985.
LED tubes. LED tube is a type of LED lamp used in fluorescent tube luminaires with G5 and G13 bases to replace traditional fluorescent tubes. [1] As compared to fluorescent tubes, the most important advantages of LED tubes are energy efficiency and long service life. LED tubes are sometimes also referred to as ‘LED fluorescent tubes’.
Aquion Energy was a Bethlehem, Pennsylvania and Washington, D.C.–based company that manufactured sodium ion batteries (salt water batteries) and electricity storage systems.
BL 15-inch Mk I naval guns firing, interwar view of a Queen Elizabeth-class battleship - the right-hand gun in each turret has just fired and the degree of recoil is evident. The BL 15-inch Mark I gun proved its effectiveness at the Battle of Jutland in 1916, scoring hits out to 19,500 yards (17,800 m), a record for naval gunnery at that time. [10]
Fluorescent lamps in various embodiments. Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics.
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