{TAIL ~ The piston machine} illustrated in FIGS 1 4, which can be used as a compressor or as an expansion motor , will be described in detail hereinafter with reference to its use as a compressor, followed by a brief explanation of its use as {HEAD ~ an expansion motor} 
{ TAIL ~ The piston machine } illustrated in FIGS 1 4 , which can be used as a compressor or as an expansion motor , will be described in detail hereinafter with reference to its use as a compressor , followed by a brief explanation of its use as { HEAD ~ an expansion motor }
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