Andre DUPRAT
France

Among their offerings, produced the possibly the lightest steel cottered cranks.
 8.2.2014                Click images for larger view
 

Mike Barry of Bicycle Specialties comments:
"The best of all, in my opinion, were the French
Duprat which had hollow steel arms. Their weight was very little more than alloy ones and they were quite elegant.

In the Speedplay Vintage Bike Components Museum Flickr site: HERE and HERE

Duprat hollow steel cottered cottered crank
Courtesy Bryant Bambridge

     

Patent sheets from 1934 detailing the hollow crank arms
Courtesy Christoph Guder

“Maniplum” Dural (aluminum alloy) cottered crank
Courtesy Bryant Bambridge

     

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