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Device for the calculation of the characteristics of rectilinear

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

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Drafting device

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

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Drafting device

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

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Drafting device

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

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Drawing instrument

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

Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
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Mini-drafting machine

Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
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Multi-functional ruler

Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
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Multi-purpose drawing ruler

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

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

Geometrical instruments – Straightedge type – 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
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Rolling ruler

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