1. 
   GAI-DO1
   Towed twin 20mm anti-aircraft mount, Oerlikon [CH]
   Found op http://www.jedsite.info/index.html
   
   
2. 
   Gai-Do1
   The Oerlikon GAI-DO1 (HS 666) is a Swiss twin mounting anti-aircraft guns comprised of two Oerlikon KAD 20 mm cannons on a hydraulic powered platform. The GAI-DO1 is designed for low level air defence and fires at a rate of 1000 rounds per barrel per minute with a muzzle velocity of 1050 metres per ...
   Found op http://www.probertencyclopaedia.com/browse/FYG.HTM
   
   

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