Learning clock

Details Learning clock Learning clock

1997-10-27

1999-02-09

Holtje, Martie K.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10 22, D10126, 1907

Patent

active

D04054709

REFERENCES:
patent: D104443 (1937-05-01), Elkonin
patent: D135472 (1943-04-01), Scott
patent: D137404 (1944-03-01), Booharin
patent: D256807 (1980-09-01), McLean
patent: D270523 (1983-09-01), Mox
patent: D299662 (1989-01-01), Cobb
patent: D377949 (1997-02-01), Woldenberg et al.
patent: 909756 (1909-01-01), Longtine
patent: 2994970 (1961-08-01), Spooner
patent: 4124945 (1978-11-01), Totten
patent: 4219953 (1980-09-01), Grimes
patent: 5612932 (1997-03-01), Albenda

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