Why Roof Control Plans
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Shows that the collapse of roofs and ribs in coal mines can be prevented by following an approved roof-control plan. Explains basic plans, provides examples and describes the implementation of a plan. Describes types of roof support, areas covered, types of rock strata, mining equipment and materials, roof-bolting machines and support timbers.
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- 16mm Filmography (legacy record) — title, year, creator, format, sound, description, catalog record
Original permalink · Record added 2023-02-27 06:57:49