9x12 Bend tests welded tubes. Tubes are used for steel scaffolding for which no inspection requirements existed. See b.nr. 11814 to 1st date: 1946 Keywords: TUBE, scaffolding Stock Photo - Alamy
First Tube Photograph by David Powell | Pixels
Double Convertible Buccal Tubes (No HG tube) – Maxillary 1st Molar (Auxillary Tube) XT (L:4.0,T:-20°,R:20°D) – GC Orthodontics Inc.