Home > Term: flapper-topped air crossing
flapper-topped air crossing
Eng. An air crossing fitted with a double door or valve giving direct communication between the two air currents when forced open by the blast of an explosion.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)
