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  2. Filing cabinet - Wikipedia

    en.wikipedia.org/wiki/Filing_cabinet

    Filing cabinet. A filing cabinet (or sometimes file cabinet in American English) is a piece of office furniture for storing paper documents in file folders. [ 1] In the most simple context, it is an enclosure for drawers in which items are stored. The two most common forms of filing cabinets are vertical files and lateral files.

  3. Stationery - Wikipedia

    en.wikipedia.org/wiki/Stationery

    Stationery. Stationery refers to commercially manufactured writing materials, including cut paper, envelopes, writing implements, continuous form paper, and other office supplies. [ 1] Stationery includes materials to be written on by hand (e.g., letter paper) or by equipment such as computer printers .

  4. Timeline of United States inventions (1890–1945) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    A magnetic proximity fuze is a type of proximity fuze that initiates a detonator in a piece of ordnance such as a land mine, naval mine, depth charge, or shell when the fuse's magnetic equilibrium is upset by a magnetic object such as a tank or a submarine. In 1943, Panayottis John Eliomarkakis of Philadelphia filed U.S. patent #2,434,551 which ...

  5. Magnet - Wikipedia

    en.wikipedia.org/wiki/Magnet

    A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets. A permanent magnet is an object made from a material ...

  6. Business card - Wikipedia

    en.wikipedia.org/wiki/Business_card

    A Oscar Friedheim card cutting and scoring machine from 1889, capable of producing up to 100,000 visiting and business cards a day. Business cards are cards bearing business information about a company or individual. [1] [2] They are shared during formal introductions as a convenience and a memory aid.

  7. Electromagnetic lock - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_lock

    Operation. The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.

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