Hood for instrument flight training

Photography and optical equipment – Optical article not elsewhere specified – Lens or objective

Patent

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Details

D 2234, D023, D1606

Patent

active

D02685930

REFERENCES:
patent: D238831 (1976-02-01), Helfand
patent: 3225459 (1965-12-01), Wilstein
patent: 3392461 (1968-07-01), Jenison
patent: 3710392 (1973-01-01), Morris, Jr.

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