Helicopter step

Details Helicopter step Helicopter step

1980-02-13

1984-12-04

Tung, T.

Transportation

Aircraft, spacecraft, or fuselage

Element or attachment

D12326, D12203, D25 63

Patent

active

D02766035

REFERENCES:
patent: D169635 (1953-05-01), Richards
patent: D194399 (1963-01-01), DeMuth
patent: D229045 (1973-11-01), Woodall
patent: D243854 (1977-03-01), Pelky
patent: 2991118 (1961-07-01), Sleger
patent: 3904155 (1975-09-01), Chavis
patent: 4020920 (1977-05-01), Abbott

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