Free images results:
 

Blades pictures, stock photos and images

 
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Blades Royalty Free Stock Images
Author: Jennywoo
Lion 01 Royalty Free Stock Images
Author: The-huhu
Watermill Stock Photos
Author: Pryzmat
Wind Power Stock Image
Author: Nitzu
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Knife Blades Stock Images
Author: Rzs