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The manual withdrawal device realizes the withdrawal and discharging on the withdrawal objects by driving the bottom frame and the blow off valve to move up and down through the pull rod. 本實(shí)用新型通過(guò)拉桿 帶動(dòng)底閥、排空閥的上、下運(yùn)動(dòng)，實(shí)現(xiàn)對(duì)抽取對(duì)象的抽取排出。 ip.com