Prism clock

Details Prism clock Prism clock

1986-09-29

1989-08-01

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Changeable exhibitor, e.g., digital type

D10 21

Patent

active

D03025284

REFERENCES:
patent: D240661 (1976-07-01), Fujiwara
patent: D241772 (1976-10-01), Igo
patent: D250252 (1978-11-01), Booty
patent: D254980 (1980-05-01), White
patent: D255106 (1980-05-01), Bodenrader
patent: D268011 (1983-02-01), Bryk
patent: D270522 (1983-09-01), Cook

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