This is a very important advantage compared with {HEAD ~ the conventional manufacture} of {TAIL ~ conical coils} by winding up onto a conical mandrel 
of
This is a very important advantage compared with { HEAD ~ the conventional manufacture } of { TAIL ~ conical coils } by winding up onto a conical mandrel
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH