Technical bulletins TB (series). 5-9860-1. Preventive maintenance services: Crane, revolving, truck mounted, pneumatic-tired, gasoline, 2-engine drive, 20-ton, class 13. Thew-Lorain model MC-6×6, with Waukesha model 6-MZR and Hercules model HXC engines; Aug. 1, 194.

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