Perpetual calender-clock

Details Perpetual calender-clock Perpetual calender-clock

1994-09-27

1995-10-17

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Combined

Patent

active

D03632270

REFERENCES:
patent: D89744 (1933-05-01), Bourquin
patent: D122892 (1940-10-01), Horsley
patent: D269503 (1983-06-01), Huffman
patent: D288417 (1987-02-01), Morrison
patent: D307396 (1990-04-01), Ilacia
patent: 4709493 (1987-12-01), Sapp

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