The apparatus 2 wherein the pitch of the array of mounting holes in {TAIL ~ each} of two orthogonal directions is {HEAD ~ an integral submultiple} of the expected minimum center to center distance of the chips arranged on the circuit board 
The apparatus 2 wherein the pitch of the array of mounting holes in { TAIL ~ each } of two orthogonal directions is { HEAD ~ an integral submultiple } of the expected minimum center to center distance of the chips arranged on the circuit board
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH