Sand timer

Details Sand timer Sand timer

1986-03-10

1989-04-18

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Sandglass

Patent

active

D03007251

REFERENCES:
patent: D248542 (1978-07-01), Jacobs
patent: D282056 (1986-01-01), Levine
patent: 3438197 (1969-04-01), Roer
patent: 3707842 (1973-01-01), Spivak
patent: 4648721 (1987-03-01), Shapiro

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