Sound-attenuating earcups

Details Sound-attenuating earcups Sound-attenuating earcups

1983-05-12

1985-10-29

Corrigan, Jane E.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D14 36, D14 67

Patent

active

D02811596

REFERENCES:
patent: D135674 (1943-05-01), Williams et al.
patent: D197773 (1964-03-01), Ugartechea
patent: D214128 (1969-05-01), Eriksson
patent: 1536712 (1925-05-01), Hehnly
patent: 3087028 (1963-04-01), Bonnin

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