Bicycle sprocket crank arm

Transportation – Cycle or motorcycle – Element or attachment

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D03724441

REFERENCES:
patent: 4816009 (1989-03-01), Phillipp
patent: 5060536 (1991-10-01), Boys
"Ross Catalog", 1966, p. 3, item No. 106W.
"Bike Nashbar", Christmas 1988, p. 34, C Crank.
"American Bicyclist and Motorcyclist", Oct. 1993, p. 29, Crank on Schwinn Bike.

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