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Cover of Up, down, or open-moving machines

a novel ·

Up, down, or open-moving machines

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Discusses how simple machines work using drawbridges, escalators, and retractable roofs as examples.

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Discusses how simple machines work using drawbridges, escalators, and retractable roofs as examples.

M

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"Discusses how simple machines work using drawbridges, escalators, and retractable roofs as examples."

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