# Relationship history for MSHA mine 0301166

Current hierarchy: **Yarbrough Glen A → Yarbrough Coal Company Inc → Slate Hill Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Yarbrough Glen A → Slate Hill Strip; 1975-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Development Corp Of Arkansas → Slate Hill Strip; 1975-12-01 to 1976-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Brown Jack → Slate Hill Strip; 1975-12-01 to 1976-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Brown Jack → Energy Development Corp Of Arkansas; 1975-12-01 to 1976-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Yarbrough Coal Company Inc → Slate Hill Strip; 1976-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Yarbrough Glen A → Yarbrough Coal Company Inc; 1976-09-20 to current/open; source msha-controller-operator-history