Hourglass timer

Details Hourglass timer Hourglass timer

1988-11-14

1991-11-19

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Sandglass

Patent

active

D03216691

REFERENCES:
patent: 2358791 (1944-09-01), Collopy
patent: 3707842 (1973-01-01), Spivak

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