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美国克劳姆普奥有限公司生产一种快速装卸护丝(见附图)。这种护丝只要一经套在管子螺纹上,就能立即把紧,用以承受巨大的冲击和振
The United States Clough Proctor Co., Ltd. to produce a quick loading and unloading silk (see photo). This kind of wire as long as the set in the pipe thread, you can immediately tight, to withstand the huge impact and vibration