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Teagle was a motorcycle clip-on engine produced in Cornwall from 1952 to 1956.
Teagle Machinery of Blackwater, Truro, Cornwall
Formed by William Thomas Teagle (1911-1989), a prolific inventor.
1940 (1943?) Company formed
The 50cc two-stroke engine was derived from a garden power tool, and sat over the rear wheel of a bicycle with friction roller drive. It was constructed mainly from light-alloy with one major casting.
It was first seen late in 1952, but did not reach the market until 1954. By that time it had become dated and was outstripped by the moped.
Also produced the B2 four-cycle 126cc engine
Engine production ceased around 1960
1967 December. Exhibited at the Earl's Court with the Dominant single and double swath haymakers 
2015 Company still trading - See Teagle Web site
The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X