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Scale balancing device in drawing machine

Geometrical instruments – Straightedge type – Base attached
Patent

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Scale balancing device in universal parallel ruler device

Geometrical instruments – Straightedge type – Base attached
Patent

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Scale balancing device in universal parallel ruler device

Geometrical instruments – Straightedge type – Base attached
Patent

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Scale balancing device in universal parallel ruler device

Geometrical instruments – Straightedge type – Base attached
Patent

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Scale balancing device in universal parallel ruler device

Geometrical instruments – Straightedge type – Base attached
Patent

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Scale balancing device in universal parallel ruler device

Geometrical instruments – Straightedge type – Base attached
Patent

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Scaling parallel bar

Geometrical instruments – Straightedge type – Base attached
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Seam line marker

Geometrical instruments – Straightedge type – Base attached
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Self-locking-and-measuring ruler for computer-printout forms

Geometrical instruments – Straightedge type – Base attached
Patent

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Students multi-function protractor

Geometrical instruments – Straightedge type – Base attached
Patent

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