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BASF had pattented before WW1 some protective coat for the airplanes and they are used [in 1912]. In first time no protection is used but this caused fabric vey soon to be useles. Fokker airplane come in 1917 and it is hard to believe that no protection is used. Alan Toelle findings are interesting.
Dan San- where is made directives that fabric on German airplanes must be protected by any means, dope or varnish?
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