| http://www.w3.org/ns/prov#value | - The first stage refrigeration part includes a first stage regenerator where refrigerant gas is supplied, a cylinder connected to a cold end of the first stage regenerator, that is, to a port where the temperature of the gas becomes lower of the 2 ports where the refrigerant gas is supplied, and provided inside this cylinder is a piston which varies the volume of expansion room formed inside the cy
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