Teledyne Post Hemmi Vintage 3 Sided Drafting Engineer Ruler

Specifications

This is a vintage wood triangular drafting or engineering scale ruler, potentially manufactured by brands like Teledyne Post or Hemmi. Triangular rulers like this typically feature multiple scales, such as ratios for architectural or engineering plans, rather than standard linear measurements. These tools were common for drafting before computer-aided design (CAD) became standard.

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