Universal Cryogenic Tank Division - Universal Industrial Gases, Inc.   - Offering cryogenic storage tanks for liquid nitrogen, oxygen, argon, and carbon dioxide, cryogenic liquid trailers, vaporizers, pressure vessels, LNG, and Ethylene tanks - new and used. An exceptionally useful web site in general, including explanations - http://www.uigi.com/cryotank.html 
Quantum Technology   - Manufacturer of low-temperature scientific intruments, including helium and nitrogen liquifiers, coolers, dewars, sensors and instrumentation, compressors, and superconducting magnets. In Whistler, BC, Canada and Blaine, Washington, with offices in many - http://www.quantum-technology.com/ 
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