In a Review of the Paris Show by Andre' Rabault,     Cycling Magazine, Oct 17, 1962:
"Stronglight, the Stephanoise firm who before the war introduced the square fitting for crank spindles, has perfected its products by attaching the second and third chain rings with countersunk bolts and nuts with six hollow faces, a system that has been long desired."

The elegant steel Stronglight cranks

        
      

A brief historical summary of
 STRONGLIGHT Forged Aluminum 5 Arm Crank Sets  HERE

Headsets

 Traditional style mod. P3