DUMEZ HAS 478,125 UNITED WESTBURNE<UWI.TO>SHARES Dumez Investments Inc said it is accepting and paying for 478,125 shares of United Westburne Industries Ltd in response to its 25 dlr per share tender offer and it has extended the offer until June 26. Dumez, 70 pct owned by Dumez SA <DUMP.PA> and 30 pct by Unicorp Canada Corp <UNIA.TO>, said the 478,125 shares represent 81.6 pct of those not controlled by Westburne International Ltd, which Dumez previously acquired in a tender.