While in 1890, the arithmometer was still the most produced mechanical calculator in the world, ten years later, by 1900, four machines, the comptometer and Odhner's Arithmometer in Russia, and Brunsviga in Germany had passed it in volume of machines manufactured.
32.
The Bell Punch Company ( named after its first product, a ticket punch with a bell used by tram and bus conductors ) had been producing a very successful range of key-driven mechanical calculators of the Comptometer type under the names " Plus " and " Sumlock ", since the 1930s.
33.
1961 was a doubly notable year for the Bell Punch Company since it then also amalgamated its calculator division with the British operation of Comptometer Corporation of Chicago, U . S . A . ( formerly the Felt & Tarrant Manufacturing Co . ), to form Sumlock Comptometer Ltd . It thus gained the right to use the name " " Comptometer " " and even manufactured mechanical calculators to be sold by Comptometer Corporation in the U . S . A.
34.
1961 was a doubly notable year for the Bell Punch Company since it then also amalgamated its calculator division with the British operation of Comptometer Corporation of Chicago, U . S . A . ( formerly the Felt & Tarrant Manufacturing Co . ), to form Sumlock Comptometer Ltd . It thus gained the right to use the name " " Comptometer " " and even manufactured mechanical calculators to be sold by Comptometer Corporation in the U . S . A.
35.
1961 was a doubly notable year for the Bell Punch Company since it then also amalgamated its calculator division with the British operation of Comptometer Corporation of Chicago, U . S . A . ( formerly the Felt & Tarrant Manufacturing Co . ), to form Sumlock Comptometer Ltd . It thus gained the right to use the name " " Comptometer " " and even manufactured mechanical calculators to be sold by Comptometer Corporation in the U . S . A.
36.
1961 was a doubly notable year for the Bell Punch Company since it then also amalgamated its calculator division with the British operation of Comptometer Corporation of Chicago, U . S . A . ( formerly the Felt & Tarrant Manufacturing Co . ), to form Sumlock Comptometer Ltd . It thus gained the right to use the name " " Comptometer " " and even manufactured mechanical calculators to be sold by Comptometer Corporation in the U . S . A.
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