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  2. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    The safest angle for a ladder is 75.5°; if it is too shallow, the bottom of the ladder is at risk of sliding, and if it is too steep, the ladder may fall backwards. This angle is achieved by following the 4 to 1 rule for a ladder placed on a vertical wall: for every four feet of vertical height, the ladder foot should move one foot from the wall.

  3. Roofer - Wikipedia

    en.wikipedia.org/wiki/Roofer

    Ladder falls contribute to the rates of injury and mortality. More than half a million people per year are treated for fall from ladder and over 3000 people die as a result. [ 22 ] In 2014 the estimated cost annual cost of ladder injuries, including time away from work, medical, legal, liability expenses was estimated to reach $24 billion. [ 22 ]

  4. Jaipur foot - Wikipedia

    en.wikipedia.org/wiki/Jaipur_foot

    The Jaipur foot is composed of a wooden ankle and a rubber heel and forefoot section, all surrounded by a thin outer layer of tire cord, a rubber composite. [ 3 ] It is a modification of the Solid Ankle Cushioned Heel (SACH) foot, with the wooden ankle of the SACH foot replaced with a more flexible block of rubber, which allows the user to ...

  5. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Jacob's ladder (nautical) - Wikipedia

    en.wikipedia.org/wiki/Jacob's_ladder_(nautical)

    It is the use of spreaders (long treads that extend well past the vertical ropes) in a pilot ladder that distinguishes it from a Jacob's ladder. When not being used, the ladder is stowed away, usually rolled up, rather than left hanging. On late 19th-century warships, this kind of ladder would replace the normal fixed ladders on deck during battle.

  7. DIN 7876 - Wikipedia

    en.wikipedia.org/wiki/DIN_7876

    DIN 7876 may be applied to all full-foot and open-heel fin models made from either rubber or plastic, but the standard excludes long-bladed fins for competitive use. In the interests of health and safety, this standard stipulates that no protruding edges should be in evidence at any point of contact between the fins and the feet.

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