Anodizing
Black Oxide
zinc plating
Gold plating
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BLACK OXIDE (BLACKENING ) ON STEEL
钢鉄发黑
Black oxide (Blackening ) on steel –MIL-DTL -13924D
钢鉄发黑 – MIL-DTL-13924D
Black oxide (Blackening ) on steel –MIL-DTL -13924D
钢鉄发黑 – MIL-DTL-13924D
