Building material drilling equipment
作者： Qian Guochen
DOI:
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摘要: Building material drilling equipment is used for a hole in building (94) below the punching equipment. The comprises housing (91) being propped against fixed object above equipment, wherein two pressing screw components (8) are mounted on upper side wall of (91); symmetric about longitudinal axis and each component threaded sleeve (82) (81) which thread fit with (821) lower end (82).
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