发明名称 Quick manhole/handhole construction method and related devices
摘要 A quick manhole/handhole construction method and related devices is provided that includes a cutting unit and a manhole/handhole cover lifter. The cutting unit includes a radial feeding device, a cutting plate, a base, and a vessel, for easily carrying out the cutting task by fixing the base and operating the radial feeding device. The lifter is a single frame, and can be used to lift a manhole/handhole cover.
申请公布号 US6536987(B2) 申请公布日期 2003.03.25
申请号 US20010866611 申请日期 2001.05.30
申请人 CHANG MING-HUANG 发明人 CHANG MING-HUANG
分类号 E01C23/09;(IPC1-7):E01C23/00;E21B7/00;E21C25/00 主分类号 E01C23/09
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