1 - Classic single seat fighter biplane

 2 - developed between the wars

 3 - unequal span staggered biplane

 4 - used by multiple nations

 5 - wing bracing by "N" struts.

 6 - ailerons on both wings

 7 - fixed L.G. split type, oleo sprung

 8 - wheels were housed in streamlined fairings, were fitted with brakes.

 9 - For winter operations ski's could be fitted to under carriage

10 - early versions had an open cockpit, later built were furnished

      with an enclosed cockpit.

11 - Powered by a licensed built 12 cyl. engine

12 - used by 9 countries according to Wicki's count

1 - Classic single seat fighter biplane

 2 - developed between the wars

 3 - unequal span staggered biplane

 4 - used by multiple nations

 5 - wing bracing by "N" struts.

 6 - ailerons on both wings

 7 - fixed L.G. split type, oleo sprung

 8 - wheels were housed in streamlined fairings, were fitted with brakes.

 9 - For winter operations ski's could be fitted to under carriage

10 - early versions had an open cockpit, later built were furnished

      with an enclosed cockpit.

11 - Powered by a licensed built 12 cyl. engine

12 - used by 9 countries according to Wicki's count

13 - Only the the very first design prototype was powered by a radial,all subsequent production versions were 12 cyl 

       12Y type.

Gary