| Wells |
A well is a permanent complete enclosure around a fixed ladder, which is attached to the walls of the well. Proper clearances for a well will give the person who must climb the ladder the same protection as a cage.
출처: safety.uchicago.edu/3_16glossary.html
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| Wells |
abandoned wells
출처: www.ciesin.org/metadata/documentation/vocab/envir....
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