Keyboard for a calculator or a combined calculator and watch or

Details Keyboard for a calculator or a combined calculator and watch or Keyboard for a calculator or a combined calculator and watch or

1975-03-06

1977-03-22

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Dial, indicator hand, or other element or attachment

D1007

Patent

active

D02437511

REFERENCES:
patent: 3738099 (1973-06-01), Tanaka
patent: 3803834 (1974-04-01), Reese
patent: 3813533 (1974-05-01), Cone
patent: 3867619 (1975-02-01), Arauchi

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