- The
Comptometer was the
first commercially successful key-driven
mechanical calculator,
patented in the
United States by Dorr Felt in 1887. A key-driven...
-
industrial production of the more
successful Odhner Arithmometer in 1890. The
comptometer,
introduced in 1887, was the
first machine to use a
keyboard that consisted...
-
Florida Tech Easy
Instructions for
Operation the
Controlled Key
Comptometer,
Comptometer Division, Felt and
Tarrant Mfg. Co., Chicago, 1917, p. 12 Carl...
- not gain
widespread use
until Dorr E. Felt
started manufacturing his
comptometer (1887) and
Burroughs started the
commercialization of
differently conceived...
-
built by the Bell
Punch Co. in Britain, and
marketed through its
Sumlock Comptometer division, they used
vacuum tubes and cold-cathode
switching tubes in...
- the only
other competitor in true
commercial production, had sold 100
comptometers. It wasn't
until 1902 that the
familiar push-button user
interface was...
-
larger facilities in Dyersville, Iowa 1967 - Ertl is
acquired by
Victor Comptometer Corporation 1971 - Ertl
acquires Carter Tru-Scale 1973 - Ertl begins...
- the
Comptometer Corporation,
which produced calculating machines and a
telecommunication device called the Electrowriter. In 1965
Victor Comptometer Corporation...
-
American inventor and
industrialist who was
known for
having invented the
Comptometer, an
early computing device, and the Comptograph, the
first printing adding...
-
general practitioner. For many
years from the 1960s,
Harper worked as a
comptometer operator at the
Barnsley Co-operative Society.
During this time Harper...
