Sun Hemmi Vintage Triangular Scale Ruler

Sun Hemmi triangular ruler and scales. Japanese company known for high-quality slide rules. Made with bamboo body and celluloid. Features red, green, and black colors. Triangular scales known as architectural or engineering scales. Used to create precise drawings, blueprints, and floor plans. Measures approx 13" long and 1" wide on all three sides. Excellent Vintage condition.