Unit Rig was a manufacturer of haul trucks, sold under the brand name Lectra Haul. == History == Unit Rig was founded in 1935 by Hugh S. Chancey and two partners, Jerry R. Underwood and William C. Guier, who formed a partnership to build a rotary drill rig for oil field work that was more mobile than existing designs.
Unit Rig was a manufacturer of haul trucks, sold under the brand name Lectra Haul. == History == Unit Rig was founded in 1935 by Hugh S. Chancey and two partners, Jerry R. Underwood and William C. Guier, who formed a partnership to build a rotary drill rig for oil field work that was more mobile than existing designs.
Source: Wikipedia "Unit Rig" · CC BY-SA 4.0
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