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mechanical:assembly,
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removable:device,
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practical:system,
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mechanical:system,
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mechanical:arm,
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movable:part,
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external:device,
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moving:means,
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mechanical:device,
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physical:device,
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moveable:structure,
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rigid:body,
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single:device,
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ancillary:device,
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moving:system,
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movable:member,
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complex:device,
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moving:device,
Category Nuances for robot_arm:
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physical,
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moving,
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practical,
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external,
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mechanical,
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ancillary,
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moveable,
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movable,
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complex,
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removable,
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rigid,
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single,
Simple Categories for robot_arm: