Headphone demonstration unit

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

Patent

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Details

D14 36, D14 37, D 6114, D1401

Patent

active

D02541319

REFERENCES:
patent: D219984 (1971-02-01), Scanlon
patent: D243620 (1977-03-01), Williams
patent: D248908 (1978-08-01), Robinson
patent: 2094681 (1937-10-01), Sears
patent: 4047109 (1977-09-01), Sekiguchi
patent: 4097111 (1978-06-01), Martin

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