Combined writing board, calculator and writing instrument for at

Details Combined writing board, calculator and writing instrument for at Combined writing board, calculator and writing instrument for at

1991-05-20

1993-02-09

Vales-lado, Carmen H.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

Holder or file

D18 2, D19 78, D19 90

Patent

active

D03331628

REFERENCES:
patent: D164173 (1951-08-01), Ives
patent: D235866 (1975-07-01), Seitz
patent: D284976 (1986-08-01), Hung
patent: D287506 (1986-12-01), Lung
patent: D303401 (1989-09-01), Cross et al.
patent: D318481 (1991-07-01), Milne
patent: D318881 (1991-08-01), Chase
patent: D319262 (1991-08-01), Brinker et al.
patent: D321012 (1991-10-01), Wright

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