Combined clipboard and calculator

Details Combined clipboard and calculator Combined clipboard and calculator

1991-08-07

1993-03-23

Holtje, Nelson C.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

Holder or file

D10 2, D18 2, D19 90, D19 91

Patent

active

D03342140

REFERENCES:
patent: D240621 (1976-07-01), Houser
patent: D243688 (1977-03-01), Keyko et al.
patent: D284678 (1986-07-01), Shamoon
patent: D284976 (1986-08-01), Hung
patent: D296220 (1988-06-01), Hung
patent: D312663 (1990-12-01), Bordwell
patent: D313819 (1991-01-01), Craft, Jr. et al.
patent: 4022993 (1977-05-01), Shattuck
Hong Kong Enterprise Mar. 1989, see p. 186 calculator w/triangular buttons-desk copy.
Hong Kong, Enterprise May 1986 p. 207 see circled clipboard upper right-desk copy.
Hong Kong Enterprise May 1986 p. 288 see model #CB1 circled-left-desk copy.

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