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Definition of: cogwheel
Our photo definition of cogwheel 
(kog′·hwēl′) noun
A wheel with cogs; a gearwheel .
COGWHEELS
A. Spur–gears.
B. Spur and crown gears.
C. Bevel–gears.
D. Square gears.
E. Annular gears.
F. Elliptical gears.
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