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Ventilating shaft
noun
Definitions
Noun
- 1 Synonym of ventilation shaft.
"The tunnel was constructed about eighty years ago, and is 1 mile 1,224 yd. long, […] There are eight existing ventilating shafts varying in diameter from 8 to 10 ft. and in depth from 52 to 336 ft."
See also for "ventilating shaft"
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