Specifications of laboratory tests for approval of electric headlighting devices for motor vehicles
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Specifications of laboratory tests for approval of electric headlighting devices for motor vehicles
(Bulletin / Bureau of Labor Statistics, no. 350)(Safety code series)
G.P.O., 1924
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At head of title: U.S. Department of Labor, Bureau of Labor Statistics
"Illuminating Engineering Society, New York, N.Y., sponsor. Tentative American standard approved November 11, 1922, by American Engineering Standards Committee"