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blowback gas：泵回氣體

blow-up | 單相交 | blowback gas | 泵回氣體 | blowback | 后座, 后座力

bell shaped valve; cup valve：鐘形閥

煤氣吹管 bellow-blow-pipe; gas-blow-pipe | 鐘形閥 bell-shaped valve; cup valve | 皮帶聯(lián)結器 belt coupling

Cutting blow pipes, gas-operated：氣動切削吹管

259 鏈鋸 Chain saws | 262 氣動切削吹管 Cutting blow pipes, gas-operated | 266 制鋼絲繩機 making steel rope machine