Telephone locking device

Details Telephone locking device Telephone locking device

1976-07-23

1977-08-23

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02455200

REFERENCES:
patent: 3469041 (1969-09-01), Winston
patent: 3624317 (1971-11-01), Buckinghan et al.
patent: 3939678 (1976-02-01), Wagoner
patent: D227575 (1973-07-01), Heymann
patent: D236354 (1975-08-01), Rodriguez

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