| http://www.w3.org/ns/prov#value | - FIG. 4, including FIGS. 4A to 4D, shows details of an assembled return pipe of FIG. 3, in which FIG. 4A shows a plan view of the return pipe, FIG. 4B is a side view of the return pipe viewed from the axial direction of the screw shaft, FIG. 4C shows a side view of the return pipe viewed from a direction normal to the axial line of the screw shaft, and FIG. 4D is a front view of the return pipe;
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