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  2. Comptometer - Wikipedia

    en.wikipedia.org/wiki/Comptometer

    Comptometer. The Comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887. A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number ...

  3. Machinist - Wikipedia

    en.wikipedia.org/wiki/Machinist

    A machinist is a tradesperson or trained professional who operates machine tools, and has the ability to set up tools such as milling machines, grinders, lathes, and drilling machines. [clarification needed] A competent machinist should have a well-developed mechanical aptitude, the ability to correctly use precision measuring instruments ...

  4. History of operating systems - Wikipedia

    en.wikipedia.org/wiki/History_of_operating_systems

    Run queues evolved from a literal queue of people at the door, to a heap of media on a jobs-waiting table, or batches of punched cards stacked one on top of the other in the reader, until the machine itself was able to select and sequence which magnetic tape drives processed which tapes. Where program developers had originally had access to run ...

  5. Heavy equipment operator - Wikipedia

    en.wikipedia.org/wiki/Heavy_equipment_operator

    Heavy equipment operator. A wheeled front loader at work. This wheeled tractor is equipped with a large bucket, which can be raised or lowered by hydraulic arms. A heavy equipment operator operates heavy equipment used in engineering and construction projects. [1] [2] Typically only skilled workers may operate heavy equipment, and there is ...

  6. Industrial training institute - Wikipedia

    en.wikipedia.org/wiki/Industrial_training_institute

    Industrial training institutes ( ITI) and industrial training centers ( ITC) is a qualification and are post-secondary schools in India constituted under the Directorate General of Training (DGT), Ministry of Skill Development and Entrepreneurship, Union Government, to provide training in various trades. [2] [3]

  7. Press brake - Wikipedia

    en.wikipedia.org/wiki/Press_brake

    Press brake. A press brake is a machine used for bending sheet metal and metal plate, most commonly sheet metal. [1] It forms predetermined bends by clamping the workpiece between a matching top tool and bottom die. [2] Typically, two C-frames form the sides of the press brake, connected to a table at the bottom and on a movable beam at the top.

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