| http://www.w3.org/ns/prov#value | - The control part 5 is comprised of electrical circuits such as ICs or capacitors, or the like, and is provided with a pressurizing control means for operating the compressor 21 in response to a sensed signal from the pressure sensor 7 when a pressure in the tank becomes less than a low side set pressure P1 (0.3 kgf/cm2 in the preferred embodiment) and stopping the compressor 21 when the pressure i
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