Learning clock

Details Learning clock Learning clock

1998-10-14

1999-06-08

Holtje, Martie K.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10 25, D10125, D19 59, 1907

Patent

active

D04106849

REFERENCES:
patent: D218344 (1970-08-01), Baumann
patent: D273873 (1984-05-01), Alessio
patent: D282825 (1986-03-01), Kostios
patent: D290936 (1987-07-01), Hill
patent: 3022582 (1962-02-01), Pitt
patent: 3465512 (1969-09-01), Usui et al.
patent: 4102060 (1978-07-01), Berry
patent: 4219943 (1980-09-01), Grimes
patent: 4731025 (1988-03-01), Taylor

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