Sequence learning toy

Details Sequence learning toy Sequence learning toy

1999-02-10

1999-08-31

Holtje, Martie K.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D19 59, D21650, 1907

Patent

active

D04133552

REFERENCES:
patent: D154739 (1949-08-01), Bersudsky
patent: D164549 (1951-09-01), Brice
patent: D206531 (1966-12-01), Raiford
patent: D234798 (1975-04-01), Johnstone
patent: D247259 (1978-02-01), Yonezawa
patent: 2728168 (1955-12-01), Gier
patent: 2853831 (1958-09-01), Bischoff
patent: 4509920 (1985-04-01), Kaufmann

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