Collapsible headset

Details Collapsible headset Collapsible headset

1979-05-30

1982-09-21

Tung, T.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02662442

REFERENCES:
patent: D196654 (1963-10-01), Van Den Berg
patent: D244300 (1977-05-01), Besasie
patent: 1677185 (1928-07-01), Kaisling
patent: 2407731 (1946-09-01), Woodruff
patent: 3053944 (1962-09-01), Weeks
patent: 3272926 (1966-09-01), Falkenberg
patent: 3488457 (1970-01-01), Lahti
patent: 3810525 (1974-05-01), Crenna
patent: 3863028 (1975-01-01), Fixler

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