Vintage Old Stock Lot of 10 Pearwood ARCHITECT Scale Drafting RULER TRIANGLE Central No. 900 is a high-quality drafting tool designed by Alvin, a reputable brand known for producing precise and durable tools. Made in Germany, this ruler triangle is a reliable companion for architects, engineers, and students in the field of drafting and design. With its elegant pearwood design and accurate scale markings, this ruler triangle is a must-have for anyone involved in the world of engineering and science.