4. Geometrical instruments
  5. Straightedge type
  6. With means for moving straightedge over a surface
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Rolling rule

Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
Patent

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Rolling ruler

Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
Patent

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Rolling ruler having a retractable and rotatable pivot pin

Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
Patent

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