DISRAELI DOCUMENTS

L'Officiel A.C.M. 1st November 1952 - Le nouveau dérailleur Cyclo

L'Officiel A.C.M. 1st November 1952 - Le nouveau dérailleur Cyclo main image

This brief paragraph describes a Cyclo derailleur with a floating pulley wheel. Cyclo also applied for a patent (French Patent # 1,064,020) covering a floating pulley wheel. I just don't yet know which derailleurs used this kind of pulley.

(Source gallica.bnf.fr/ Bibliothèque nationale de France)