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08.11.1949 Tillman Ferdinand J : Typewriter calculating machine
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15.11.1949 Ferdinand J. Tillman : Typewriter calculating machine
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22.11.1949 Herrick, R. R. (P) : Fuel Mileage Calculator
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06.12.1949 Clair D. Lake Benjamin M. Durfee Arthur H. Dickinson IBM (P) : Record controlled calculating machine
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