Patent

Patent:US1000363 15.08.1911 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Actuating device for key set calculating machines
Patent:US1003086 12.09.1911 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Key set calculating machine
Patent:US1003414 19.09.1911 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Rotary retarding mechanism for adding machines and like devices
Patent:US1017843 20.02.1912 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Transfer mechanism for calculating machines
Patent:US1023235 16.04.1912 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Calculating-machine
Patent:US1108118 25.08.1914 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Actuating device for key set calculating machines
Patent:US1108119 25.08.1914 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Item-counter for calculating-machines
Patent:US1130463 02.03.1915 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Operating-handle for adding-machines
Patent:US1173640 29.02.1916 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Auxiliary keyboard for calculating machines
Patent:US1326564 30.12.1919 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Computing and recording machine
Patent:US994238 06.06.1911 Barrett, Glenn (P) Barrett (P) Adding Machine Co. : Transfer mechanism for adding machines

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