A cam device moves each piston reciprocally and includes {HEAD ~ a rotating member} having a first camming surface which is cylically rotated adjacent an end of {TAIL ~ each piston} 
A cam device moves each piston reciprocally and includes { HEAD ~ a rotating member } having a first camming surface which is cylically rotated adjacent an end of { TAIL ~ each piston }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL