The longitudinal members of {HEAD ~ the frame} may be formed of {TAIL ~ sections} of EMT material, or may alternatively be formed of poles cut in the field, if so desired 
The longitudinal members of { HEAD ~ the frame } may be formed of { TAIL ~ sections } of EMT material , or may alternatively be formed of poles cut in the field , if so desired
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH