Novelty timing device

Details Novelty timing device Novelty timing device

1989-05-01

1990-05-15

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Sandglass

Patent

active

D03078701

REFERENCES:
patent: D166043 (1952-02-01), Miller
patent: D209531 (1967-12-01), Koch
patent: D276508 (1984-11-01), Howard
patent: 3553959 (1971-01-01), Young
patent: 3563024 (1971-02-01), Breed

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