Old 02-25-12, 05:53 PM
  #12  
JohnDThompson 
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Originally Posted by onespeedbiker View Post
Suntour had a closely guarded patent on the slant parrellegram from 1964 to 1984 and no other derailleurs utilized the slant parallelogram design except Suntour.
FWIW, in the early 70s, the original Lambert rear derailleur had a slant parallelogram as well:

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