Rollien Raymond Wells

Use of Torque Wrench to Determine Load in Roof Bolts

Slotted-type bolts

The investigation reported in this paper is one of several included in a broad program of developing new or improved concentration processes for the o...

Design and Test Operation of a Pneumatic Vibrating-blade Planer

A Progress Report on Phosphate-mining Research, 1956-57

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Anthracite Mechanical Mining Investigations

Progress Report 6 : Preliminary Testing of Brieden Pneumatic Packing Machine

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Effect of Pressure on the Explosibility of Acetylene-water Vapor, Acetylene-air, and Acetylene-hydrocarbon Mixtures

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