Push-button enlarger for attaching over telephone multifrequency

Details Push-button enlarger for attaching over telephone multifrequency Push-button enlarger for attaching over telephone multifrequency

1976-03-10

1978-03-14

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02474921

REFERENCES:
patent: D211094 (1968-05-01), Ling et al.
patent: D218755 (1970-09-01), Bennett
patent: D222142 (1971-10-01), Barr
patent: 3739105 (1973-06-01), Anson
patent: 3927282 (1975-12-01), Firstenberg
patent: 4002855 (1977-01-01), Schiffman

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