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United States of America Patent Nr. 2,719,879

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United States of America Patent Nr. 2,719,879

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Patent

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Material from the private estate of Anton Marian Springer

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14_Brief [Letter] Prof. Dr. A.D. Fokker aan [to] Ir. G.L. Tegelberg, 28.07.1934

Certificate by the Acoustical Society of America 1. Oktober 1956

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