Began operations in 1990, Tishler Industries Inc. operates as a manufacturer of medium to heavy welded-plate products. The firm specializes in the fabrication of containment vessels, pressure vessels and steel products. Located in St. Louis, Mont., the company is a part of Gate City Steel Group that operates three divisions. Tishler Industries Inc. specializes in prototype product development, computer-aided design, engineering detailing, material and cost control, product fabrication as well as job scheduling, among others.