(under the class definition) Apparatus in which there are means for compressing, cooling, and expanding gas which remains throughout in a gaseous state.
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86+, for related processes.
172, for automatic control of related apparatus.
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165, Heat Exchange,
121+, for a heat exchanging and air pump combination of general application. 418, Rotary Expansible Chamber Devices,
83+, for rotary expansible chamber devices having heat exchange means.
