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2. Ladder - Wikipedia

   en.wikipedia.org/wiki/Ladder

   A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.

3. John H. Balsley - Wikipedia

   en.wikipedia.org/wiki/John_H._Balsley

   John H. Balsley. John H. Balsley (May 29, 1823 – March 12, 1895) was a master carpenter and inventor, inventing a practical folding wooden stepladder and receiving the first U.S. patent issued for a safety stepladder in the year. He was born in Connellsville, Fayette County, Pennsylvania to George H. and Sarah (Shallenberger) Balsley.

4. Step ladder - Wikipedia

   en.wikipedia.org/?title=Step_ladder&redirect=no

   This page was last edited on 18 July 2020, at 11:41 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may ...

5. Pain ladder - Wikipedia

   en.wikipedia.org/wiki/Pain_ladder

   Pain ladder. "Pain ladder", or analgesic ladder, was created by the World Health Organization (WHO) as a guideline for the use of drugs in the management of pain. Originally published in 1986 for the management of cancer pain, it is now widely used by medical professionals for the management of all types of pain .

6. Three Steps - Wikipedia

   en.wikipedia.org/wiki/Three_Steps

   Three Steps. North Face of Mount Everest. "1st", "2nd", and "3rd" indicate the Three Steps. The Three Steps are three prominent rocky steps on the northeast ridge of Mount Everest. They are located at altitudes of 8,564 metres (28,097 ft), 8,610 metres (28,250 ft), and 8,710 metres (28,580 ft). The Second Step is especially significant both ...

7. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   The tread depth of a step is measured from the edge of the nosing to the vertical riser; if the steps have no nosing, it is the same as the going; otherwise it is the going plus the extent of one nosing. The going of a step is measured from the edge of the nosing to the edge of nosing in plan view. A person using the stairs would move this ...