# Relationship history for MSHA mine 4300762

Current hierarchy: ** → Ferguson Slate Co → Ferguson Slate Co Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Jeff  Ferguson → Ferguson Slate Co Quarry; 1997-05-13 to 2016-09-28; source msha-controller-operator-history
- **operator_operates_mine:** Ferguson Slate Co → Ferguson Slate Co Quarry; 2014-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Ferguson → Ferguson Slate Co; 2014-02-24 to 2016-09-28; source msha-controller-operator-history