A basket strainer installationremoval tool has an internally threaded cylindrical passageway extending therethrough. More specifically, this invention relates to an electric machine having a ferromagnetic vessel containing a single-pole magnetic field, end caps for reflecting magnetic energy and a shaft having an electromagnetic coil which moves relative to the magnetic field. The above object is achieved by disposing a second evaporator between an automated expansion valve to decompress the refrigerant exhausted from a compressor and the first evaporator so as to reduce the absorbed heat at the first evaporator. Next, the liquid segments and the air segments of each cycle are transferred from the second fluid conduit to a third fluid conduit. The inner ring is provided on its outer circumferential wall with recesses such that lube-oil receiving and accumulating parts are formed between the cylindrical wall of the outer ring and the outer circumferential wall of the inner ring. Moreover, it is also possible to employ such a structure that at least two signal differential amplifying means are arranged on a substrate provided with at least two magnetic sensors and there is provided a circuit wiring for causing an output sent from each of the magnetic sensors to pass through the signal differential amplifying means.