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Die große Enzyklopädie des mechanischen Rechnens

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Search results for: Petschenig, Karl


 
  • Patent:GB393828 15.06.1933 Petschenig, Karl (P) Optische Anstalt C. P. Goerz (P) : Improvements in range and direction calculating apparatus for artillery
  • Patent:US2053737 08.09.1936 Petschenig, Karl (P) Optische Anstalt C. P. Goerz (P) AG : Calculating Apparatus

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