n.air passage consisting of a ventilation shaft through which air leaves a mine

Copper melting upcasting furnace
Clutch for crystallizer of upcasting furnace
Discussion on Upcasting Process of C65100 Silicon Bronze Bar
The research of the quality of the upcasting copper role
Mathematical modeling of copper and brass upcasting
Analysis of the Melting Channel Break for Upcasting Equipment and Control
Micro-Gravity Environment & the Hydraulic Upcasting System of the Micro-Gravity Tower
Electromagnetic stirring (EMS) in continuous upcasting of copper and copper alloys
Environmental-friendly method for smelting and upcasting of electrical copper rod from low-grade copper
Building an enabling policy environment for upcasting and mainstreaming agricultural biodiversity to support nutrition sensitive foo...