Comptometer, manual operation
1930-1940
Burroughs hand operated adding and listing machine
1917
Comptometer by Felt and Tarrant Mfg. Co. Chicago
1915-1920
Burroughs Class 5 hand operated mechanical adding machine with ten registers
1920-1925
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
Burroughs class 5 automatic (electrically driven) adding machine
1940-1950
Comptometer by Felt & Tarrant Manufacturing Co.
1920-1925
Electric Comptometer by Felt and Tarrant
1950-1965
Comptometer, without lid
1914