In transmitting devices such as garage door operators, the values of V1 and V2 depend on the type and quality of {HEAD ~ equipment} used to receive signals from the transmitting device and open {TAIL ~ the garage door} 
used to open
In transmitting devices such as garage door operators , the values of V1 and V2 depend on the type and quality of { HEAD ~ equipment } used to receive signals from the transmitting device and open { TAIL ~ the garage door }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL