Vintage Sterling MFG Co. Triangular Scale Engineer Drafting Ruler white

This triangular scale is in good condition, it marked ‘STERLING’ on the scale, and ‘Alvin’ on the case.

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See pictures for details.

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This triangular scale is in good condition, it marked ‘STERLING’ on the scale, and ‘Alvin’ on the case.

Vintage Sterling MFG Co. Triangular Scale Engineer Drafting Ruler white