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55 (LV) — 1944-1945
Hand and Mechanical Stoking, 204.
Haulage, 136, 274.
Headgear Pulley, 216.
Heat, 4, 13, 31, 39, 50, 62, 78, 90, 128, 135, 149, 158, 171, 188, 195, 206, 222, 234, 246, 259, 266, 277, 294.
Heights and Distances, 245.
Highest Common Factor, 145.
Horizontal Force, 177.
Huwood Air Pick, 296.
Hydraulic Lifting-jack, 96.
Hydrogen Sulphide, 185.
Hygrometer, 15.
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