adjust {TAIL ~ the acceleration} or deceleration of {HEAD ~ said advance means} to drive said instantaneous gap value g toward said nominal gap value, whereby the number of documents passing through the system per unit time may be controlled and maximized 
adjust { TAIL ~ the acceleration } or deceleration of { HEAD ~ said advance means } to drive said instantaneous gap value g toward said nominal gap value , whereby the number of documents passing through the system per unit time may be controlled and maximized
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH