Headset-hardhat adapter

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

Patent

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D1403

Patent

active

D02481588

REFERENCES:
patent: D239034 (1976-03-01), Stilgenbauer
patent: 3134861 (1964-05-01), Dempsey et al.
patent: 3629522 (1969-04-01), Richards
patent: 3787641 (1974-01-01), Santori
patent: 3889190 (1975-06-01), Palmer
patent: 3890475 (1975-06-01), Denhart
patent: 3902025 (1975-08-01), Lewis

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