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