Security telephone

Details Security telephone Security telephone

1978-06-14

1981-04-28

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02590433

REFERENCES:
patent: D218940 (1970-10-01), Tyson et al.
patent: D219224 (1970-11-01), Payne
patent: D251844 (1979-05-01), Kramer
patent: 3911446 (1975-10-01), Albertini
patent: 3982072 (1976-09-01), Dean

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