Numerals 75, 76 and 77 denote {HEAD ~ a discriminator}, a relay and a contact of {TAIL ~ the relay} 76, respectively 
Numerals 75 , 76 and 77 denote { HEAD ~ a discriminator } , a relay and a contact of { TAIL ~ the relay } 76 , respectively
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH