File:Oerlikon GDF-003 35mm Twin Cannon.jpg - Wikimedia Commons
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Oerlikon - Wiktionary, the free dictionary
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Category:Oerlikon AA gun | World War II Wiki | Fandom
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File:Oerlikon GDF-006 35mm Twin Cannon Display at Chih Hang Air Force Base Apron 20130601a.jpg - Wikipedia
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File:Oerlikon 35-mm twin cannon towed anti-aircraft guns, CFB Gagetown, New Brunswick.JPG - Wikimedia Commons
Oerlikon 20 mm cannon - Wikipedia
