This is an inspection unit for down hole pipe. A well is expensive to drill and start production so everything has to be gauranteed to work. Body wall of the pipe is measured so the oil company knows that there are no flaws in the material before going down-hole.
These are thongs and slips that are used on a rig to "trip pipe"(connect joints of pipe). The slips are on the bottom of the rig floor and hold the pipe from sliding down into the well. The thongs are like a big mechanical pipe wrench. It's what the rig hands use to spin the pipe so it connects to another joint and can then be lowered into the well.
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