BUZZ — India's Zetwerk Manufacturing's $518 — mln IPO opens for subscription
* Zetwerk Manufacturing Businesses' $518-mln IPO opens for subscription, with the three-day bidding process to remain open till Oct 19 * Industrial and consumer products maker is targeting a valuation of 255.83 billion rupees ($2.69 billion), at the top end of the IPO price band of 143 to 151 rupees per share * On Wedn