n.拔管机，拉丝机，拉床
The pic is not clear, but it feels like drawbench silver work.
图还是看不清, 但感觉是拉丝银工艺.
Cold working strain phosphating includes drawbench phosphating, cold extrusion phosphating and cold stamping phosphating.
冷加变形磷化主要包括拉丝磷化 、 冷挤磷化、冷冲磷化.
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