Foreign language teaching aid

Details Foreign language teaching aid Foreign language teaching aid

1986-07-10

1990-06-12

Largen, James R.

Office supplies; artists and teachers materials

Teaching material

D21 34, D21 36

Patent

active

D03085414

REFERENCES:
patent: 1707323 (1929-04-01), Schaffer
patent: 2852260 (1958-09-01), Caffrey
patent: 3831946 (1974-08-01), Denalsky
patent: 4363628 (1982-12-01), Kirkpatrick et al.
patent: 4545582 (1985-10-01), Andrews
patent: 4682777 (1987-07-01), Wood
patent: 4714255 (1987-12-01), Henry et al.

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