Mathematic teaching rack

Details Mathematic teaching rack Mathematic teaching rack

1994-06-06

1996-08-27

Lucas, Susan J.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

Patent

active

D03731448

REFERENCES:
patent: D149083 (1948-03-01), Mooney
patent: D169562 (1953-05-01), Rieck
patent: D184042 (1958-12-01), Dochterman et al.
patent: D300040 (1989-02-01), Dermody
patent: 3455034 (1969-07-01), Schott
patent: 3811205 (1974-05-01), Pitzler
patent: 3995378 (1976-12-01), Darnell
patent: 4233757 (1980-11-01), Narcise
patent: 4812124 (1989-03-01), Colodner et al.
patent: 4884973 (1989-12-01), Pak
patent: 5205747 (1993-04-01), Tan

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