linkage means interconnecting {HEAD ~ each} of {TAIL ~ said float members} and at least one of said pumping units, 
linkage means interconnecting { HEAD ~ each } of { TAIL ~ said float members } and at least one of said pumping units ,
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH