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… upon each material or fitting being properly fitted and erected in the approved manner so that each 'A' or 'B' … scantlings of the bulkhead specimens which are used to test 'A' Class insulations. If bulkheads of lesser scantlings … 4.13.7 Spaces in which fire extinguishing gas cylinders are stored 4.13.7.1 The ventilation system serving …
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