The General Ordnance Co. was based in New York City and began to produce tractors when it took over the Denning Tractor Co. of Cedar Rapids, Iowa in May 1919. At first they rebranded the Denning as the "National", but this was soon replaced by the company initials "G-O". Two models of "G-O" tractor were offered, a 12-22 and a 14-28, the latter of which used a Waukesha engine and was also known as the Model G. Transmission was via a friction-drive mechanism. In the UK, the Denning and "G-O" tractors were sold by Noyes, Stockwell & Co Ltd, Norfolk Street, The Strand, London.

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