This is the first of three derailleur patents held by Henry & Arthur Fitzpatrick of Burnley. It describes a very tidy, but reasonably conventional, pull-chain device.

• Publisher: UK Intellectual Property Office
• Inventor: Henry Fitzpatrick & Arthur Allan Fitzpatrick
• Country: UK
• Date: Priority date September 1943
• Derailleur brands: Fitzpatrick
• Derailleurs: Unknown