Explanatory notes
… drive from the main shaft to a number of machines, or to different parts of a machine. (3) Articulated shafts , … conical gears, helical gears, worms, rack and pinion gears, differential gears, etc., and assemblies of such gears. It … described above (gear boxes, transmission shafts, clutches, differentials, etc.), but which are designed for use solely …