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60 (LX) — 1949-1950
H.M. Inspectors of Mines : Centenary Address, 219, 236, 247.
Hammer-blow in Pipes, 86.
Hand Pumps, 65.
Haulage, Power Required, 238.
Heat, Quantity of, 174.
Heat, Transference of, 229.
Heating, Detection of, 146, 298.
Hopper, Capacity of, 153, 299.
Huwood 50-cycle Electric Shot-hole Drill, 83.
Hydrometers, 45.
Hydrox Cartridge, 82.
Hygrometer, 190.
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