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acesman said:The Lufwaffe in North Africa (1940) used the sharkmouth on Me-110's (ZG26 and/or ZG76. The first sharkmouth that I have found was in the Spanish Civil War, on a Bf-109C, photo shown on the fillowing page;
http://www.geocities.com/CapeCanaveral/Hangar/7252/109c.htm