Oblong end opening switch construction

Claim 1

IN COMBINATION: AN ACTUATING AND FIRST FULCRUM MEMBER HAVING A FIRST PROTRUDING TONGUE AND A RESPECTIVELY LEAF SPRING ENGAGING EDGE SHOULDER ON EACH SIDE OF SAID TONGUE; A SECOND FULCRUM MEMBER HAVING A SECOND PROTRUDING TONGUE ALIGNED WITH SAID FIRST TONGUE AND HAVING A RESPECTIVE LEAF SPRING ENGAGING SHOULDER ON EACH SIDE OF SAID SECOND TONGUE; A FLEXIBLE, THIN, HARD METAL, ELONGATED LEAF SPRING WHICH IS FREE OF LOCAL STRESS PRODUCING SHARP BENDS, NOTCHES AN INTERNAL CORNERS AND HAVING AN ARCUATE MAIN BODY WITH ROCKING END PORTIONS FREE OF LINE FOLD DEFORMATION ENGAGING RESPECTIVE ONES OF SAID EDGE SHOULDERS WITH SUBSTANTIALLY STRAIGHT SURFACES WHICH ARE EXTENSIONS OF SAID ARCUATE MAIN BODY, SAID END PORTIONS EACH HAVING A RESPECTIVE TONGUE RECEIVING OBLONG OPENING HAVING ARC SHAPED END PORTIONS, WHICH OPENING IS FREE OF LOCAL STRESS PRODUCING SHARP BENDS, NOTCHES AND INTERNAL CORNERS, SAID OPENING LOOSELY LIMITING THE TURNING MOVEMENT OF A RESPECTIVE TONGUE IN SAID OPENING AND CONFINING THE SIDEWISE AND ENDWISE MOVEMENT OF SAID LEAF SPRING TO MAINTAIN SAID LEAF SPRING SUBSTANTIALLY ALIGNED BETWEEN SAID FULCRUM MEMBERS.