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In page Pentaerythritol tetranitrate:
"Pentaerythritol tetranitrate was first prepared and patented in 1894 by the explosives manufacturer Rheinisch-Westfälische Sprengstoff A.G. of Cologne, Germany.[1][2][3][4] The production of PETN started in 1912, when the improved method of production was patented by the German government. PETN was used by the German Military in World War I.[5][6] It was also used in the MG FF/M autocannons and many other weapon systems of the Luftwaffe in World War II.[citation needed]
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