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Updated: May 8, 2025
There have been numerous unconfirmed reports concerning the use of cellon, a tough and yet completely transparent material, in the construction of aeroplanes on the German side, and occasional hints of new "invisible" machines were dropped now and then.
The reports probably are based on some foundation of fact, but there is little to show that cellon is used to any large extent by the Teuton forces. Samples of the material reached New York late in 1915, but the actual uses to which it was put were not known at the time.
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