Large telephone keyset

Details Large telephone keyset Large telephone keyset

1980-10-23

1984-02-14

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D14 53, D1403

Patent

active

D02726220

REFERENCES:
patent: D232365 (1974-08-01), Churchill et al.
patent: D246650 (1977-12-01), Peral-Hernandez
patent: D251844 (1979-05-01), Kramer
patent: D256919 (1980-09-01), White
patent: D257772 (1981-01-01), Fukutani
patent: D259212 (1981-05-01), Foggia
patent: 4153822 (1979-05-01), Ueda et al.
patent: 4286124 (1981-08-01), Guttmann
Telephony, Mar. 12, 1979, p. 49, Digital Telephone System Inc.

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