Code for identification of gas-mask canisters
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Code for identification of gas-mask canisters
(Bulletin / Bureau of Labor Statistics, no. 512)(Safety code series)
U.S. G.P.O. , For sale by the Supt. of Docs., U.S. G.P.O., 1930
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Note
"American recommended practice approved January 7, 1930, American Standard Association"
At head of title: United States Department of Labor... Bureau of Labor Statistics...