| 21. | There are three air shafts along its length.
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| 22. | A sheer undercurtain hides the air shaft view.
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| 23. | Air shafts are used on many converting machines.
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| 24. | Ventilation is via air five air shafts.
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| 25. | The white pipe to the right is the air shaft used to get air to the miners.
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| 26. | At one point, he led the group through a pipelike air shaft near the top of the dam.
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| 27. | By using former air shafts the museum plans to enlarge and renovate its Thomas J . Watson Library.
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| 28. | Air shafts are constructed in longer " surangas " to supply fresh air and to expel poisonous gases.
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| 29. | Remnants of the coal mine can still be found, e . g ., air shaft near old Grade School.
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| 30. | Tenement dwellers tossed garbage, bilge water and waste into these air shafts which were not designed for garbage removal.
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