| 申请人 |
DE BEERS INDUSTRIAL DIAMOND DIVISION (PROPRIETARY) LTD., JOHANNESBURG, TRANSVAAL, ZA |
发明人 |
BURNAND, RICHARD PATRICK, JOHANNESBURG TRANSVAAL, ZA;CHAPMAN, RAYMOND ALBERT, JOHANNESBURG TRANSVAAL, ZA;MARTELL, TREVOR JOHN, WELTEVREDEN PARK TRANSVAAL, ZA;PARSONS, STEPHEN ANTHONY, JOHANNESBURG TRANSVAAL, ZA |
