MIL-P-18317
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MIL-P-18317, MILITARY SPECIFICATION: PLATING, BLACK NICKEL (ELECTRODEPOSITED) ON BRASS, BRONZE, OR STEEL (22 DEC 1954)., This specification covers one type, class, and grade of plating, black nickel (electrodeposited) for blackening brass, bronze and steel surfaces, applicable where a minimum distraction of the operators vision is desired as in the interior of optical instruments.
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