| Ace Tank & Equipment Co.: Manufactures and distributes petroleum storage tanks and petroleum handling equipment. |
| Commercial Welding Co.: Manufacturers of above ground steel storage tanks. |
| Denali Incorporated: Manufactures fiberglass composite underground storage tanks, steel rectangular aboveground storage tanks and engineered fiberglass reinforced composites for handling corrosive fluids. (Nasdaq: DNLI). |
| Freeman Brothers: Above ground fuel tanks for petroleum products containments. |
| Oreco A/S: Systems for automated cleaning of oil storage tanks. Desludging, cleaning and hydrocarbon recovery using environmentally friendly processes. |
| SuperSafe Tanks Inc.: Manufacturers of above ground fuel storage tanks providing safe storage of petroleum products for vehicles and aircraft, fueling stations, heating oil storage, chemicals, and hazardous waste containment. |
| Tanco Engineering, Inc.: Provides the petrolium industry with tank construction and renovation services. |
| Trans-Tainer Pty Ltd.: Transportable intermediate bulk containers of stainless and carbon steel. Operating in Australia. |
| TS Tanksystem SA: Gauging and sampling equipment for storage tanks and marine vessels. Ball valves. Temperature gauges. |
| Wilco Machine & Fab, Inc.: Manufacturer of machined and fabricated metal products and equipment for the oil and gas service industry. Products include ASME pressure vessels, bulk storage and conveying equipment. |
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