![]() ![]() For example, the leftmost type 51 above is date code 1957 week 40 and is identifiable as an device based on the unique oval case shape and two-hole bottom header construction. ![]() used transistors manufactured by other companies for the 608 as well as transistors manufactured by. 1 Early Transistors: Shown at top are a series of early transistors that were qualified for use in the Model 608 calculator, introduced in The chart above lists the range of transistors types available at this time.
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