Combined earphones and earmuffs

Details Combined earphones and earmuffs Combined earphones and earmuffs

1989-12-11

1992-03-03

Shooman, Theodore M.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

Patent

active

D03243869

REFERENCES:
patent: D254876 (1980-05-01), Reitenga et al.
patent: D292331 (1987-10-01), Bryant
patent: D301477 (1989-06-01), Storyk
patent: 2776436 (1957-01-01), Berg
patent: 4546215 (1985-10-01), Ferraro
patent: 4654898 (1987-04-01), Ishikawa
patent: 4669129 (1987-06-01), Chance

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