Detachable ratio for helmets

Details Detachable ratio for helmets Detachable ratio for helmets

1976-04-09

1977-12-20

Stearman, Joel

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1403

Patent

active

D02467127

REFERENCES:
patent: D203115 (1965-12-01), MacFarlane
patent: D211951 (1968-08-01), Thomson et al.
patent: D227908 (1973-07-01), Romano
patent: D235350 (1975-06-01), Hanson
patent: 2143483 (1939-01-01), Iglauer

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