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Digital image proportion analyzer

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent

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Digital protractor

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Reexamination Certificate

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Digital protractor

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Reexamination Certificate

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Disposable striking line dispenser

Geometrical instruments – Straightedge type – Cord type
Patent

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Dock leveler apparatus

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Reexamination Certificate

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Double cut edger

Geometrical instruments – Straightedge type – Rules
Patent

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Drafting aid

Geometrical instruments – Straightedge type – Rules
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Base attached
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Base attached
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Base attached
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Base attached
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Base attached
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Base attached
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Base attached
Patent

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Drafting apparatus

Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Reexamination Certificate

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Drafting board storage tray

Geometrical instruments – Straightedge type – Base attached
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 – Base attached
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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