The suction heads 21a, 21b and 21c have their increased diameter base portions 31 closely engaged in {HEAD ~ the recesses} 29 in {TAIL ~ the head holders} 22 
The suction heads 21a , 21b and 21c have their increased diameter base portions 31 closely engaged in { HEAD ~ the recesses } 29 in { TAIL ~ the head holders } 22
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH