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DEAR SIR,WE REQUIRE OXYGEN CONCENTRATORS OF 10 LITER/MIN CAPACITY. QTY - 500 NOS. PURITY 93 +/- 3% AT ALL FLOW RATES. QUALITY OF PRODUCT AND ITS PERFORMANCE IS UTMOST IMPORTANT. THE SUPPLIER OF THE PRODUCT SHOULD BE IN BUSINESS OF THE PRODUCT FOR AT LEAST 5 YEARS. oxygen concentrator Vending machines