Number | Name | Date | Kind |
---|---|---|---|
3677342 | Silverman | Jul 1972 | |
3771600 | Hill | Nov 1973 | |
4043597 | French | Aug 1977 | |
4043598 | French | Aug 1977 |
Number | Date | Country |
---|---|---|
1012564 | Jun 1977 | CAX |
Entry |
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L. C. Lang, "The Application of Spherical Charge Technology in Stope and Pillar Mining", Engineering and Mining Journal, _May 1976, pp. 98-101. |