Combined electronic clock and perpetual calendar

Details Combined electronic clock and perpetual calendar Combined electronic clock and perpetual calendar

1978-11-28

1981-04-07

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Combined

D19 25, D1004

Patent

active

D02588110

REFERENCES:
patent: D89744 (1933-05-01), Bourquin
patent: D106037 (1937-09-01), Hentschel
patent: D106038 (1937-09-01), Hentschel
patent: D210676 (1968-04-01), Miley
patent: D242905 (1977-01-01), Eschenfeldt
patent: 3668858 (1972-06-01), Hartwig
patent: 4094082 (1978-06-01), Cannarozzo

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