Well Drilling Equipment

Do the companies that create well drilling equipment make other things as well or are they dedicated to that rare specialty item to make all of their in come too? They make lots of things for the oil industry now. Do the companies that create well drilling equipment make other things as well or are they dedicated to that rare specialty item to make all of their in come too? They work in refineries materials as well for more money. Do the companies that create well drilling equipment make other things as well or are they dedicated to that rare specialty item to make all of their in come too?

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