Toroidal wrist watch

Details Toroidal wrist watch Toroidal wrist watch

1984-07-30

1987-05-12

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Watch, wristwatch or case

Wrist type

D10 30

Patent

active

D02897407

REFERENCES:
patent: 2463315 (1949-03-01), Rosen
patent: 2763122 (1956-09-01), Hayes
patent: 4473304 (1984-09-01), Ketner

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