This particular oil field drill pipe 10 shown herein is intended to be merely typical of the general range of oil field tubular goods, such as {HEAD ~ subs}, drill pipes, {TAIL ~ casing}, tubings, drill collars, line pipe and the like with which the present invention may be used, having connections on their ends which are threaded or machined and thus are vulenarable to rusting and pitting 
This particular oil field drill pipe 10 shown herein is intended to be merely typical of the general range of oil field tubular goods , such as { HEAD ~ subs } , drill pipes , { TAIL ~ casing } , tubings , drill collars , line pipe and the like with which the present invention may be used , having connections on their ends which are threaded or machined and thus are vulenarable to rusting and pitting
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 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH