see also Cycling - Osgear advert (1st style)

1. Date: 1939
   

2. Derailleur brands: Osgear
   

3. Derailleurs: Osgear Empire
   

see also Cycling - Osgear advert (2nd style)

1. Date: 1939
   

2. Derailleur brands: Osgear
   

3. Derailleurs: Osgear Super Champions, Osgear Professional, Osgear Grand Sport, Osgear Champion du Monde, Osgear Empire
   

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 UK patent # 601,743

1. Date: UK application 1945
   

2. Derailleur brands: Constrictor, Osgear
   

3. Derailleurs: Constrictor
   

see also UK patent # 601,744

1. Date: UK application 1945
   

2. Derailleur brands: Constrictor, Osgear
   

3. Derailleurs: Constrictor prototype
   

see also Constrictor Derailleur - instructions

1. Date: 1946
   

2. Derailleur brands: Constrictor, Osgear
   

3. Derailleurs: Constrictor
   

see also Holdsworth - Aids to Happy Cycling

1. Date: 1949
   

2. Derailleur brands: Constrictor, Cyclo Gear Company, GB, Huret, Osgear, Resilion, Simplex, TriVelox
   

3. Derailleurs: too many to mention
   

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