Ground Movement and Control at Collieries

Ground Movement and Control at Collieries

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In order to prevent this, swivel tops under roof bars should be fitted to props under rippings at roadheads, and to prevent floor ... A number of different supports have been specially designed for service in this position, their selection depending upon the ... Horse-head or Forepoling Girders (N.C.B. Instruction Manual) Fig. 143anbsp;...

Title:Ground Movement and Control at Collieries
Author: John Sinclair
Publisher: - 1963

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