Hänvisningar finns i följande patent|
| US4209950 | 7 nov 1977 | 1 jul 1980 | | Grinding machine | | US4411107 | 3 dec 1980 | 25 okt 1983 | Disco Co., Ltd. | Grinding wheel for flat plates | | US4545154 | 15 aug 1983 | 8 okt 1985 | Disco Co., Ltd. | Grinding wheel for flat plates | | US4854087 | 19 feb 1988 | 8 aug 1989 | Zahnradfabrik Friedrichshafen A.G. | Grinding disc | | US5839948 | 27 aug 1996 | 24 nov 1998 | American Stonecrafters, Inc. | Right angle sanders for wet sanding | | US6179697 | 12 mar 1999 | 30 jan 2001 | Sanwa Kenma Kogyo Co., Ltd. | Grindstone adapter |
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