{HEAD ~ The interior} of housing 2 on the spring 24 side of diaphragm 7 is vented to the atmosphere by {TAIL ~ a bore} 30 formed through pin 26 
is vented by
{ HEAD ~ The interior } of housing 2 on the spring 24 side of diaphragm 7 is vented to the atmosphere by { TAIL ~ a bore } 30 formed through pin 26
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH