Protogen RPT with stainless steel tubing, 180 × 192 × 120 in. (whitney.org)
Exhibited safe tube bending and connection techniques using various sizes of stainless steel tubing for instrumentation; single and multiple tubing lines. (jobhero.com)
The Costin chassis was never put under a production car, instead the early Roadsters featured a TIG welded stainless steel tubing frame, and extensive use of CNC machined and stamped parts. (en.wikipedia.org)