Metal drill pipe and drill pipe collars fitted with transducers and coaxial cable for data transmission for use in a downhole component string for oil, gas and geothermal well production and drilling, and other subterranean excavations

Metal drill pipe and drill pipe collars fitted with transducers and coaxial cable for data transmission for use in a downhole component string for oil, gas and geothermal well production and drilling, and other subterranean excavations

Metal drill pipe and drill pipe collars fitted with transducers and coaxial cable for data transmission for use in a downhole component string for oil, gas and geothermal well production and drilling, and other subterranean excavations

polyester felt tubes filled with resin and are used to rehabilitate or fix damaged water and waste water lines