Projection clock

Details Projection clock Projection clock

1992-10-13

1995-02-21

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Patent

active

D03556077

REFERENCES:
patent: D337787 (1993-07-01), Oga
patent: 813836 (1906-02-01), Smith
patent: 2201376 (1946-05-01), Prins
patent: 2358422 (1944-09-01), Springer
patent: 2726571 (1955-12-01), Chang
patent: 3136210 (1964-06-01), Barrett
patent: 5247492 (1993-09-01), Pan
patent: 5260919 (1993-11-01), Tsai

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