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18th century surgical knee pad and dislocation machine18th century surgical knee pad in place on a leg 1, Jean Louis Petits machine for dislocated joints 2-5. Copperplate engraving by Robert Benard from Denis Diderots Encyclopedia, Pellet, Geneva, 1779
Sopwith Model V: Dislocations of coal strataThis model shows that while very little coal may appear at ground level, coal seams (subject to faults and dislocations) can be found below the ground
Sopwith Model III: Dislocation of strataThis model represents the side of a valley of denudation, with undisturbed horizontal beds of sedimentary rock when fully assembled
