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Hoists, cranes, and derricks
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Describes the three types of lifting machines, the jobs they are designed to do, and the duties of the men who operate them.
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Describes the three types of lifting machines, the jobs they are designed to do, and the duties of the men who operate them.
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"Describes the three types of lifting machines, the jobs they are designed to do, and the duties of the men who operate them."
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