Quick airtight device of unsealing

Quick airtight device of unsealing, including hollow inferior valve and hollow epitheca, characterized by: hollow inferior valve can the amalgamation become a cube with hollow epitheca, and the side of hollow inferior valve is triangle -shaped, and the side of hollow epitheca is trapezoidal, and hol...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Bu Xiaogang, Cheng Liangxiu, Wang Zongmin, Wang Mingfeng, Pang Lei
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS MINING SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS
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