4. Geometrical instruments
  5. Straightedge type
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Protractor

Geometrical instruments – Straightedge type – Square and pivoted straightedge
Patent

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Protractor

Geometrical instruments – Straightedge type – Square and pivoted straightedge
Reexamination Certificate

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Protractor for calculating miter and bevel angles for...

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

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Protractor unit for drawing-board

Geometrical instruments – Straightedge type – Base attached
Patent

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Protractor with a rotor

Geometrical instruments – Straightedge type – Base attached
Patent

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Protractor with an auxiliary ruler

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

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Protractor-chalkline

Geometrical instruments – Straightedge type – Cord type
Patent

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Push stick with slide-out ruler

Geometrical instruments – Straightedge type – Square and sliding nonpivotal straightedge
Reexamination Certificate

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