An Erickson Air-crane Skycrane lowers one of 39 direct-fired make-up air heaters into position atop Caterpillar Tractor Company's new basic engine plant under construction in Mossville, Illinois. Maker of the heaters, Dravo Corp. in Pittsburgh, moved them part way by barge. Each unit measured 32 by 22 ft by 12 ft high. From Vertiflite, March/April 1974 (page 30).
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