| http://www.w3.org/ns/prov#value | - In the embodiment shown` in Figures 1, 2 and `3, a shaft l5 is rotatably located in ahousing le and driven by bevel gears I1 from a shaft i8, the latter being located in the same housing. ` .For drivingthe shaft I8, an electric or other motor may be directly connected to the housing le or the shaft i8 may be connected to one end of a `flexible shaft, the other end. of which is driven from some dis
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