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Johnson was a motorcycle that originated in the United States of America, produced circa 1921 to 1924.
This machine was flat twin-cylinder, two-stroke, single-speed, chain-drive cycle attachment. American in origin, it had powered generators in the trenches during the Great War.
After the War was over, it was used over the rear wheel of a bicycle, and better known as the Economic. In both cases it was short-lived as supplies soon dried up.
An earlier Johnson motorcycle was produced at Johnson Cycle Works, Scunthorpe