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  2. NCR Century 100 - Wikipedia

    en.wikipedia.org/wiki/NCR_Century_100

    The memory of the Century Series computers used machine-made, short, iron-oxide-coated ceramic rods1 ⁄ 16 inch (1.6 mm) long and approximately the diameter of a human hair— as their random access memories, instead of the hand-labor-intensive core memories that were used by other computers of the time.

  3. PCB NC formats - Wikipedia

    en.wikipedia.org/wiki/PCB_NC_formats

    The IPC-NC-349 format is the only IPC standard governing drill and routing formats. [5] XNC is a strict subset of IPC-NC-349, Excellon a big superset. Many indefinite NC files pick some elements of the IPC standard. [1] A digital rights managed copy of the specification is available from the IPC website, for a fee.

  4. Garage door opener - Wikipedia

    en.wikipedia.org/wiki/Garage_door_opener

    The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

  5. Poly(methyl methacrylate) - Wikipedia

    en.wikipedia.org/wiki/Poly(methyl_methacrylate)

    It has a density of 1.17–1.20 g/cm 3, [1] [16] which is approximately half that of glass, which is generally, depending on composition, 2.2–2.53 g/cm 3. [1] It also has good impact strength, higher than both glass and polystyrene, but significantly lower than polycarbonate and some engineered polymers.

  6. Threaded rod - Wikipedia

    en.wikipedia.org/wiki/Threaded_rod

    A threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. [1] They are designed to be used in tension. [2] Threaded rod in bar stock form is often called all-thread (ATR); other names include fully-threaded rod, redi-rod, continuously-threaded rod ...

  7. DOORS - Wikipedia

    en.wikipedia.org/wiki/Rational_DOORS

    DOORS was created by Dr Richard Stevens, a researcher through the 1970's and 1980's at the European Space Agency's Research Institute (ESRIN). The first version was provided to the UK Ministry of Defence in 1991-2.

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