# Relationship history for MSHA mine 4002457

Current hierarchy: **Spradlin Ewell L → Ewell L Spradlin Coal Company → Bear Wallow Tipple**

- 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:** Spradlin Ewell L → Bear Wallow Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid Atlantic Of Tennessee → Bear Wallow Tipple; 1978-01-01 to 1981-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Collins Claude C → Bear Wallow Tipple; 1978-01-01 to 1981-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Collins Claude C → Mid Atlantic Of Tennessee; 1978-01-01 to 1981-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Ewell L Spradlin Coal Company → Bear Wallow Tipple; 1981-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spradlin Ewell L → Ewell L Spradlin Coal Company; 1981-05-11 to current/open; source msha-controller-operator-history