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Rocket Mail of the WorldGermanyWaldkraiburg, Germany %u2014 April 3, 1966 %u2014 EZ-76C1 %u2014 H.O.G. (Hermann Oberth Society).Reduced facsimile of back below.(cachet text) Hermann Oberth Society. Conference on Interior Ballistics, April 1-3, 1966 in Waldkraiburg / Upper Bavaria. Rocket glider of the H.O.G. type %u201cSwallow 2%u201d.(red rubber stamp) With H.O.G. test rocket of the 3G series trial.(text on back) The Rocket and Space Technology Training and Testing Center of the Hermann Oberth Society undertook further glider launches on an industrial site that was not open to the public, with the aim of testing radio control and ballistic behavior.The results achieved in these tests were quite useful and showed that they seemed particularly useful in wooded and impassable areas.For the previously used half-shells, support screws or wings will probably be provided in the future, as will other sliding devices.Hanover/Waldkraiburg, April 2, 1966.Executive Board of the HERMANN OBERTH SOCIETY Society for the Promotion of the Exploration and Development of Space eV (Formerly: German Rocket Society (DRG) eV).This card was part of a payload for the above-mentioned glider tests, and then handed over to the German Federal Post Office for further transport by post.