Illuminated telephone dial

Recording – communication – or information retrieval equipment – Computer – data processor equipment

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D1403

Patent

active

D02463083

REFERENCES:
patent: D197067 (1963-12-01), Dreyfuss
patent: D222142 (1971-10-01), Barr
patent: 3205318 (1965-09-01), Bilek
patent: 3345769 (1967-10-01), Nathan
patent: 3480743 (1969-11-01), Engh et al.
patent: 3523163 (1970-04-01), Andren
patent: 3927282 (1975-12-01), Firstenberg
Popular Mechanics, May 1955, pp. 151-153, How They Print for the Blind.

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