Sit-up counter

Details Sit-up counter Sit-up counter

1988-09-02

1991-03-05

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Volume, flow or rate

Patent

active

D03151115

REFERENCES:
patent: D184669 (1959-03-01), Dom
patent: D295836 (1988-05-01), Campbell
patent: D310046 (1990-08-01), Matcham
patent: 4158342 (1979-06-01), Scruggs
patent: 4164732 (1979-08-01), Pischizra
patent: 4337529 (1982-06-01), Morokawa
patent: 4371945 (1983-02-01), Kam et al.
patent: 4557215 (1985-12-01), Petersson
patent: 4846459 (1989-07-01), Vivian

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