Siva Balaji started working in his father 's Sri Balaji Group of companies ( Sri Balaji Cylinders pvr ltd , Sri Balaji Valves Pvt ltd ( DPR ) , and Sri Srinivasa cylinders pvr ltd ( hot repair unit ) ) when he was 17 and established his own MSB Industries ( valves , regulators and components manufacturing industry ) at the age of 20 .
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