A surface on the other side of the wiring board is a heat radiating surface which is thermally connected to the device forming surface and operative to radiate heat generated at {HEAD ~ the device forming surface} to {TAIL ~ the exterior} 
A surface on the other side of the wiring board is a heat radiating surface which is thermally connected to the device forming surface and operative to radiate heat generated at { HEAD ~ the device forming surface } to { TAIL ~ the exterior }
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 OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL