Electronic calculator with telephone dialer

Details Electronic calculator with telephone dialer Electronic calculator with telephone dialer

1989-06-26

1991-07-02

Holtje, Nelson C.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D18 7

Patent

active

D03179214

REFERENCES:
patent: D254435 (1980-03-01), Ferron
patent: D258892 (1981-04-01), Ohie et al.
patent: D308536 (1990-06-01), Suzuki
patent: 4672685 (1987-06-01), Phillips et al.
IBM Technical Disclosure Bulletin; Wallet Terminal Keyboard with Acoustic Coupler by M. F. Davis and R. H. Koepf; vol. 10, No. 3, Aug. 1967.
Hong Kong Enterprise; 9/1984; p. 96.

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