This invention relates to detecting and {HEAD ~ tracking} of {TAIL ~ animate and inanimate objects}, such as hollow pipes used in drilling for oil and gas by use of novel passive low radio frequency wireless tags 
of
This invention relates to detecting and { HEAD ~ tracking } of { TAIL ~ animate and inanimate objects } , such as hollow pipes used in drilling for oil and gas by use of novel passive low radio frequency wireless tags
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL 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