Description of electric power unit developed by Allen and Drew, Cambridge, Mass., for opening and closing hangar doors; Monowheel drive is capable of saving area of 1000 sq. ft. and Duplex drive unit is capable of serving area of 2500 sq. ft.
A and D hangar door drives
Aviation
Aviation ; 27 , n 13
1929
1 Fig.
Article (Journal)
English
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