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