Patent

Patent:US709362 16.09.1902 Schuman, Alexander C. (P) Spalding Coleman (P) : Calculating-machine
Patent:US709363 16.09.1902 Schuman, Alexander C. (P) Spalding Coleman (P) : Computing machine
Patent:US709364 16.09.1902 Schuman, Alexander C. (P) Spalding Coleman (P) : Dating attachment for calculating machines
Patent:US709365 16.09.1902 Schuman, Alexander C. (P) Spalding Coleman (P) : Calculating machine
Patent:US731958 23.06.1903 Schuman, Alexander C. (P) Spalding Coleman (P) : Adding attachment for type writing machines

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