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  2. Attic ladder - Wikipedia

    en.wikipedia.org/wiki/Attic_ladder

    An attic ladder (US) or loft ladder (UK) is a retractable ladder that is installed into an attic door/access panel. They are used as an inexpensive and compact alternative to having a stairway that ascends to the attic of a building. They are useful in areas with space constraints that would hinder the installation of a standard staircase.

  3. Retractable hardtop - Wikipedia

    en.wikipedia.org/wiki/Retractable_hardtop

    The third-generation Mazda MX-5 was available with an optional power retractable hardtop in place of the standard folding-textile soft-top. Compared to the regular soft-top, the hardtop weighed 77 lb (35 kg) more. It did not reduce cargo capacity. [23] The hardtop roof was polycarbonate and manufactured by the German firm Webasto. [24]

  4. Ladder paradox - Wikipedia

    en.wikipedia.org/wiki/Ladder_paradox

    The ladder frame is for a person sitting on the front of the ladder, with x ′ and t ′ being the ladder space and time axes respectively. The blue and red lines, AB and AC, depict the ladder at the time when its front end meets the garage's exit door, in the frame of reference of the garage and the ladder, respectively.

  5. Height adjustable suspension - Wikipedia

    en.wikipedia.org/wiki/Height_adjustable_suspension

    Height adjustable suspension is a feature of certain automobile suspension systems that allow the motorist to vary the ride height or ground clearance. This can be done for various reasons including giving better ground clearance over rough terrain, a lower ground clearance to improve performance and fuel economy at high speed, [ 1 ] or for ...

  6. Ladder logic - Wikipedia

    en.wikipedia.org/wiki/Ladder_logic

    Part of a ladder diagram, including contacts and coils, compares, timers and monostable multivibrators. Ladder logic is widely used to program PLCs, where sequential control of a process or manufacturing operation is required. Ladder logic is useful for simple but critical control systems or for reworking old hardwired relay circuits. As ...

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