Telephone tone dialer

Details Telephone tone dialer Telephone tone dialer

1992-02-07

1993-09-07

Douglas, Alan P.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03391400

REFERENCES:
patent: D269267 (1983-06-01), Brown
patent: D308381 (1990-06-01), Dehnert
patent: D311874 (1990-11-01), Ingram, II et al.
patent: D315109 (1991-03-01), Ingram, II et al.
patent: D319347 (1991-08-01), Vanlandingham, Jr. et al.
patent: D323469 (1992-01-01), Saito
patent: 2537598 (1951-01-01), Mason
patent: 2580845 (1952-01-01), Sam

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