Hour glass

Details Hour glass Hour glass

1999-05-24

2000-02-15

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Sandglass

1003

Patent

active

D04206037

REFERENCES:
patent: D120171 (1940-04-01), Nathan
patent: D123822 (1940-12-01), Shinn
patent: D166486 (1952-04-01), Nyholm
patent: D248542 (1978-07-01), Jacobs
patent: D338836 (1993-08-01), Marsh
patent: 3553959 (1971-01-01), Young
patent: 4267588 (1981-05-01), Daniels

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