Pulling Unit (Pulling Machine) : A portable, truck-mounted mast equipped with winch, wirelines, and sheaves, used for pulling rods or well workover. (ITOGP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}