Check the listing for details. Vintage RapiDesign No. 27 structural cross-sections. scale 1 in = 1 ft. Condition: Used. Listed at 6.99 USD. Dive into the world of precision drafting with the vintage RapiDesign No. 27 structural cross-sections ruler. This tool is a testament to timeless design and functionality, crafted in the United States and suitable for both professional and hobbyist use. Its stainless steel construction ensures durability, while the 1-inch scale represents a foot, making it an essential for architectural and engineering sketches. Whether you're a collector of vintage drafting tools or a working professional, this RapiDesign piece is a remarkable find. It hails from a period spanning from 1930 to the present and has not been modified, preserving its original craftsmanship. Add this classic piece to your collection and experience the precision of bygone eras.