see also The staff of ‘Cycling’ - Cycling Manual

1. Date: 1944
   

2. Derailleur brands:  BSA, Cyclo Gear Company, Osgear, Simplex, Sturmey-Archer, TriVelox, Villiers
   

3. Derailleurs: too numerous to list
   

see also H. H. England - Cycling Manual

1. Date: 1960
   

2. Derailleur brands: BSA, Cyclo Gear Company, Osgear, Resilion, Simplex, Sturmey-Archer, Super Champion
   

3. Derailleurs: Cyclo Benelux, Resilion Crimson Star, Simplex Juy 59