... up or breaking out pipes or casings diameters of "~13-3/8",The tong heads are designed ... easy to handle with high mobility .This series of tongs can be connected to computer comtrolling units ... for surface operations in oil fields.National Invention Patent of the tong has been got .The tongs are ... ultimate data ,such as :torque ,number of ciccles ,torque/time of .circles,torque/time. curves,date,time,well ...