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| Number | Title | Issue Date |
| 3999459 | Mine roof bolt anchor construction and method of making the same A bolt anchor construction for attaching metal plates to the roof of a mine tunnel. An expansion shell having a plurality of spaced metal fingers extending from a collar is telescopically mounted on a bolt. A camming plug is threadably mounted on one end ... | 12/28/1976 |
| 3938420 | Mine roof bolt anchor construction A bolt anchor construction for attaching metal plates to the roof of a mine tunnel. An expansion shell having a plurality of spaced metal fingers is telescopically mounted on a bolt. A camming plug is threadably mounted on one end of the bolt and is locat... | 02/17/1976 |
