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2. Doorstop - Wikipedia

   en.wikipedia.org/wiki/Doorstop

   A door may be stopped by a doorstop which is simply a heavy solid object, such as a brick, placed in the path of the door. These stops are predominantly improvised. [1] Historically, lead bricks have been popular choices when available. [3] However, as the toxic nature of lead has been revealed, this use has been strongly discouraged. [4]

3. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   A simple electromagnetic door holder consists of a strong electromagnet, usually attached to a wall or mounted in a floor pedestal enclosure, next to the door it controls. The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge).

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5. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   By contrast, the heaviest class F900 manhole cover can withstand a maximum weight of 90 tons, making it suitable for docks, airports, and other extreme heavy-duty applications. [ 31 ] EN 124 does not apply for gratings of prefabricated drainage channels (according to EN 1433) or floor and roof gullies in buildings (specified in EN 1253-1).

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