It carried twin 7.7 mm ( 0.303 in ) Vickers machine guns mounted in the nose immediately in front of the cockpit and over the engine .
The NiD 37 first appeared in public at the Paris Air Show in December 1922 , though it had not then flown .
NiD 37 carried twin 7.7 mm ( 0.303 in ) Vickers machine guns mounted in the nose immediately in front of the cockpit and over the engine .
The NiD 37 first appeared in public at the Paris Air Show in December 1922 , though it had not then flown .