# Relationship history for MSHA mine 4405737

Current hierarchy: **Davis Diane → W & D Coal Company Inc → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hale William L & Bobby → No 1; 1979-10-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & B Energy Inc → No 1; 1981-09-01 to 1987-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Hale William L & Bobby → B & B Energy Inc; 1981-09-01 to 1987-06-04; source msha-controller-operator-history
- **operator_operates_mine:** W & D Coal Company Inc → No 1; 1987-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Diane → No 1; 1987-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Diane → W & D Coal Company Inc; 1987-06-05 to current/open; source msha-controller-operator-history