Comptometer, manual operation

1930-1940

Early model wooden-case comptometer by Felt and Tarrant Manufacturing Co.

1887-1903

Felt and Tarrant Comptometer, 1887.

circa 1900

Comptometer by Felt and Tarrant Mfg. Co. Chicago

1915-1920

Section of a Comptometer by Felt & Tarrant showing mechanism

1908-1909

Comptograph, made by Felt and Tarrant Manufacturing Co.

1887-1903

Photo of Stern's calculating machine

1927

Comptometer, 8-column model E for decimal currency

1914

Comptometer by Felt and Tarrant Manufacturing Co.

1925-1927

Section of model "F" controlled-key Comptometer by Felt and Tarrant Manufacturing Co.

1921

Glass encased sectional model of Comptometer by Felt & Tarrant

1927-1928

Photo of pencil drawing of Staffel's calculating machine

1927

Comptometer by Felt & Tarrant Manufacturing Co.

1920-1925

Electric Comptometer by Felt and Tarrant

1950-1965