Index to lists of willing-to-certify sources of supply of commodities covered by federal specifications :
alphabetical list of federal specifications with specification symbols and supplement numbers.
Washington, D.C. : U.S. Dept. of Commerce, National Bureau of Standards, 1936.
Commercial products /
Commercial products / Certification /
Commercial products / Certification / United States /
"Index to supplements superseeding LC 256a."
"September 15, 1936."
12 pages ;
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