Drilling protection device for water, electricity and heating construction

The utility model relates to the technical field of water, electricity and heating construction, in particular to a drilling protection device for water, electricity and heating construction. The protective device comprises a drilling gun and a protective cover. A spiral trapezoidal groove and a plu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: WANG WENTAO, ZHANG YUSHENG, LIU XIAOYAN, JIA GUOQING, TENG JUNTAO, NIU ZUOYU, WEN HUAQUAN, XIU XIAOLONG, SUN XIAOLI
Format: Patent
Sprache:chi ; eng
Schlagworte:
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