# Relationship history for MSHA mine 4606774

Current hierarchy: **Adkins Timothy C & William G → Adkins Brothers Coal Corp → Birch Mine No 1**

- 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

- **operator_operates_mine:** Adkins Brothers Coal Corp → Birch Mine No 1; 1984-04-01 to 1985-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Timothy C & William G → Birch Mine No 1; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Timothy C & William G → Adkins Brothers Coal Corp; 1984-04-01 to 1985-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Adkins Brothers Coal Corp → Birch Mine No 1; 1985-04-22 to 1986-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Murphy James C Jr → Birch Mine No 1; 1985-04-22 to 1986-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Murphy James C Jr → Adkins Brothers Coal Corp; 1985-04-22 to 1986-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Adkins Brothers Coal Corp → Birch Mine No 1; 1986-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Timothy C & William G → Adkins Brothers Coal Corp; 1986-01-06 to current/open; source msha-controller-operator-history