A first board having a plurality of openings formed therethrough and {HEAD ~ a second parallel board} having a plurality of complementary contact elements extending into {TAIL ~ the openings} are interconnected by a heat recoverable metal motion transmitting means preferably in the form of a grid positioned between the boards 
A first board having a plurality of openings formed therethrough and { HEAD ~ a second parallel board } having a plurality of complementary contact elements extending into { TAIL ~ the openings } are interconnected by a heat recoverable metal motion transmitting means preferably in the form of a grid positioned between the boards
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH 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