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Internal combustion engine gas distributing valve mechanism with lever
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Mechanism for changing speed of driven shaft rotation
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Grip for tightening reinforcement
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Compasses
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Adjustable socket wrench
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Compasses for drawing curves
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Device for drawing
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Device to draft arc of a circle
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Method and apparatus for measuring area of opaque plane figures
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Drawing instrument
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Device for measuring radii and curvature of surfaces
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Compasses for drawing curves
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Adjustable box spanner
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Tool-clamping chuck
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Self-centering clamping chuck
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