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"obtained by rebuilding a World War I water-cooled machine gun into an air-cooled version." OK, I give, which gun? More information is needed! — Preceding unsigned comment added by 18.104.22.168 (talk) 17:16, 17 December 2012 (UTC)
I believe thee was a Dreyse MG 10 or some such thing, so that may be it. Certain internet-bound "authorities" insist that they ( the MG 13's) were not born of conversions at all, but for the time being I'll believe the likes of the late Ian Hogg, et al, that say they were. Incidentally, seeing as a link to a Spanish-language manual for the MG 13 is provided (along withe mention of its use during the Spanish Civil War), I would think it safe to assume that Spain should be listed among the weapon's operators.--22.214.171.124 (talk) 04:26, 13 January 2013 (UTC)