Teaching clock

Details Teaching clock Teaching clock

1986-12-11

1990-03-13

Vales-Lado, Carmen H.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D19 59

Patent

active

D03066118

REFERENCES:
patent: D242344 (1976-11-01), Klepsch
patent: D268686 (1983-04-01), Wolf
patent: D269790 (1983-07-01), Alessio
patent: D273873 (1984-05-01), Alessio
patent: 3508350 (1970-04-01), Genin
patent: 4015346 (1977-04-01), Ogasawara
patent: 4219943 (1980-09-01), Grimes

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