The Collaborative International Dictionary of English v.0.48:

Vickers-Maxim gun \Vickers-Maxim gun\ (Ordnance)
   One of a system of ordnance, including machine, quick-fire,
   coast, and field guns, of all calibers, manufactured by the
   combined firms of Vickers' Sons of Sheffield and Maxim of
   Birmingham and elsewhere, England.
   [Webster 1913 Suppl.]