... drilling rigs. Our skid-mounted drilling rigs include diesel electric AC/VFD or DC/SCR drive rigs, mechanical drive rigs, and combination ... , rotary tables, and top drives. The rated load of our AC/VFD drive top drives is from 190 tons to 1 ... sell unitized mud pump packages driven by AC/DC motors or diesel engines (Caterpillar, Detroit, Cummins, or other brands).Well Control Equipment We ...