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Oxygen Concentrator Inc. is the leading providers of portable oxygen rentals for travelers and patients in the Wisconsin area. We have offer a wide selection of high-quality portable oxygen concentrators available from the most trusted, professional brands like Respironics, Inogen, SeQual and Invacare. Atmospheric oxygen is used for combustion to produce energy in automobiles, aeroplanes, ships, generators, industrial process, etc. Liquid oxygen uses include burning of fuel in spacecraft for generating the required thrust in space where there is neither air nor oxygen. Rockets require liquid O 2 for burning fuel and rendering its lift.