| http://www.w3.org/ns/prov#value | - The air compressor according to claim 1, wherein the rotational speed of said motor is set multistageously to have a plurality of values such as 0, N, 2N, 3N, . . . , and nN (in which n is an arbitrary number); and one of said values is selected by said control circuit portion to thereby control said motor. 3.
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