Comptometer, manual operation
1930-1940
Felt and Tarrant Comptometer, 1887.
circa 1900
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
Early model wooden-case comptometer by Felt and Tarrant Manufacturing Co.
1887-1903
Comptometer by Felt and Tarrant Manufacturing Co.
1925-1927
Comptometer, 8-column model E for decimal currency
1914
Comptograph, made by Felt and Tarrant Manufacturing Co.
1887-1903
Section of model "F" controlled-key Comptometer by Felt and Tarrant Manufacturing Co.
1921
Photo of pencil drawing of Staffel's calculating machine
1927
Photo of Stern's calculating machine
1927
Section of a Comptometer by Felt & Tarrant showing mechanism
1908-1909
Glass encased sectional model of Comptometer by Felt & Tarrant
1927-1928
Comptometer by Felt & Tarrant Manufacturing Co.
1920-1925
Electric Comptometer by Felt and Tarrant
1950-1965
Comptometer, without lid
1914