After completion of the testing, {HEAD ~ the entire unit}, which would typically be on {TAIL ~ the order} of 60 feet long, would be sealed and transported to the installation site, where adjacent sections would be secured together to form the complete transmission line 
typically be on
After completion of the testing , { HEAD ~ the entire unit } , which would typically be on { TAIL ~ the order } of 60 feet long , would be sealed and transported to the installation site , where adjacent sections would be secured together to form the complete transmission line
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH