1. A. Hara S. Yazu Drawing die and a process for the production of the same 1983
2. T. Nakai S. Yazu Diamond for a tool and a process for the production of the same 1985
3. M. K. Keshavan Diamond-containing cemented metal carbide 1992
4. British Thomson Houston CO LTD Improvements in and relating to the manufacture of abrasive wheels 1935
5. F. H. Willey Diamond Embedded Abrading Tool 1935