The Martin B-10B is the answer I was looking for. The two firsts, according to my info, were:- 
 
 The first Bomber to carry the bombs INSIDE the fuselage,and; The first Bomber to have a machine gun TURRET (Not the first to have a defensive machine gun!)
  
 
 
 
 
 
 I think Garry is up.
  
 
 
  
  __________________ Please engage Brain before operating tongue or machinery.
 "Scale Detail equals Weight"
 Alan
 Auburn AL
          
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