Consumer appliances maker Atomberg Technologies has received approval from the Securities and Exchange Board of India (Sebi) for its proposed initial public offering (IPO), comprising a fresh issue of shares worth up to Rs 450 crore and an offer for sale of 76.5 million shares by existing investors.The Mumbai-based company filed its draft IPO papers in August. ET had reported in July that Atomberg was preparing for an offering of Rs 1,500-2,000