| http://www.w3.org/ns/prov#value | - In FIGS. 4 and 5, journal bearings 45a and 45b formed of light-weight material such as aluminum are rotatably loosely mounted in annular recesses 15a and 15b formed coaxially with the inner peripheral surface of a housing in the inner surfaces 1' and 2' of both end walls of the housing, and the opposed peripheral surface (outer peripheral surface) and the opposed side with respect to the annular r
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