{HEAD ~ A diaphragm} deflectably spans and sealingly closes the open end of the chamber and urges the pressing roller and {TAIL ~ thus the sheet material} against the driven roller with a force proportionate to the pressure prevailing in the chamber of the housing 
urges
{ HEAD ~ A diaphragm } deflectably spans and sealingly closes the open end of the chamber and urges the pressing roller and { TAIL ~ thus the sheet material } against the driven roller with a force proportionate to the pressure prevailing in the chamber of the housing
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