Ground Movement and Control at Collieries
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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