{HEAD ~ A surface} on {TAIL ~ 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 the device forming surface to the exterior 
{ HEAD ~ A surface } on { TAIL ~ 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 the device forming surface to the exterior
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH