Educational clock

Details Educational clock Educational clock

1986-04-14

1989-05-30

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Simulative

D19 64, D10126

Patent

active

D03013081

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patent: D256781 (1980-09-01), Mackey
patent: D256807 (1980-09-01), McLean
patent: D268686 (1983-04-01), Wolf
patent: D268816 (1983-05-01), Venker
patent: D275840 (1984-10-01), Riketts
patent: 340507 (1886-04-01), Hunter

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