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Patent
Suchergebnisse für: Keuffel and Esser
- Patent:US1904474 18.04.1933 Keuffel, Adolf W. (P) Keuffel and Esser (P) : Slide Rule
- Patent:US2415415 11.02.1947 Charles Christen Keuffel and Esser (P) : Calculator
- Patent:US2422649 17.06.1947 Bland, J. R. (P) Keuffel and Esser (P) : Slide Rule
- Patent:US2500460 14.03.1950 Hunt, H. (P) Keuffel and Esser (P) : Slide Rule
- Patent:US2534695 19.12.1950 Bland, J. R. (P) Keuffel and Esser (P) : Slide Rule
- Patent:US2556806 12.06.1951 Gaire, P. E. (P) Keuffel and Esser (P) : Magnifying Runner for Slide Rules
- Patent:US2602574 08.07.1952 Frederick Zener, George Mangold Keuffel and Esser (P) : Slide Rule belt carrier
- Patent:US3282500 01.11.1966 Pikus, Alfred (P) Keuffel and Esser (P) : Calculating device for solving unknown qualitative parameters
- Patent:US809075 02.01.1906 Rechnitzer, Alexander (P) Keuffel and Esser (P) : Calculator