A set of suction heads can be mounted to the head carrier in any desired arrangement, corresponding to the desired chip arrangement on the circuit board, by having {HEAD ~ their holders} removably engaged in {TAIL ~ selected ones} of the array of mounting holes in the head carrier 
removably engaged in
A set of suction heads can be mounted to the head carrier in any desired arrangement , corresponding to the desired chip arrangement on the circuit board , by having { HEAD ~ their holders } removably engaged in { TAIL ~ selected ones } of the array of mounting holes in the head carrier
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 HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH