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  2. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    An extension 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. Extension ladder - Wikipedia

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

    This page was last edited on 13 January 2006, at 22:29 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  4. File:The Extension ladder (IA extensionladder02lloy).pdf

    en.wikipedia.org/wiki/File:The_Extension_ladder...

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  5. Strain (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Strain_(mechanics)

    The stretch ratio or extension ratio (symbol λ) is an alternative measure related to the extensional or normal strain of an axially loaded differential line element. It is defined as the ratio between the final length l and the initial length L of the material line.

  6. Chu–Harrington limit - Wikipedia

    en.wikipedia.org/wiki/Chu–Harrington_limit

    The Goubau antenna from 1976 has a size ratio of 1 and bandwidth of 80%. Q is 1.5 times the limit. [10] The Foltz drawing pin like antenna from 1998 size 0.62 and 22% bandwidth. The Rogers cone from 2001 is size 0.65 and right on the limit. Lina and Choo planar spirals in size ratios range from 0.2 to 0.5

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