| http://www.w3.org/ns/prov#value | - A pulley type speed-shifting device as defined in claim 6, wherein the tension mechanism has a tension arm supporting a tension pulley and an urging means which is arranged between said tension arm and the fixed body and which urges the tension arm to let the tension pulley press the belt, and the controlling means is a checking member fixed to the fixed body which, when the tension arm moves more
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