a switch including {HEAD ~ a sensing arm} engageable with {TAIL ~ a second side} of said membrane to be displaced in response to pressure induced deflection of a contact region of said membrane contacted by said sensing arm; and 
engageable with
a switch including { HEAD ~ a sensing arm } engageable with { TAIL ~ a second side } of said membrane to be displaced in response to pressure induced deflection of a contact region of said membrane contacted by said sensing arm ; and
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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