Free images results:
 

Gears pictures, stock photos and images

 
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Watermill Stock Photos
Author: Pryzmat
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Gears Royalty Free Stock Photos
Author: Focusphoto
Gears Stock Images
Author: Jf123
Gears Stock Image
Author: Jf123
Gears Stock Photos
Author: Petrol