LandOfFree - US Patents - Listing for Geometrical instruments,Straightedge type

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Arrangement in angle rulers for improving fixture of an angularl

Geometrical instruments – Straightedge type – Pivot joints

Patent

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Art deckle

Geometrical instruments – Straightedge type – Rules

Patent

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Articulated drafting device for drawing perspectives

Geometrical instruments – Straightedge type – Base attached

Patent

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Attachment for framer's square

Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles

Patent

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Attachment for T-square for use with writing implement

Geometrical instruments – Straightedge type – Rules

Patent

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Attachment for the enhanced measurement accuracy of a combinatio

Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles

Patent

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Austin triangle

Geometrical instruments – Straightedge type – Plural nonadjustable straightedges forming nonright angles

Reexamination Certificate

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Automatically retractable chalk and plumb line assembly

Geometrical instruments – Straightedge type – Cord type

Patent

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Automatically retractable chalk line assembly

Geometrical instruments – Straightedge type – Cord type

Patent

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Automatically retractable chalk line device

Geometrical instruments – Straightedge type – Cord type

Patent

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Automatically retracting chalk line assemble

Geometrical instruments – Straightedge type – Cord type

Patent

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Automatically retracting chalk line marking tool

Geometrical instruments – Straightedge type – Cord type

Patent

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