# Relationship history for MSHA mine 4607365

Current hierarchy: **Westmoreland Coal Company → Westmoreland Coal Company → Hampton No 45**

- 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:** Westmoreland Coal Company → Hampton No 45; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Coal Corp → Hampton No 45; 1987-10-01 to 1993-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Bell Douglas-Casset Bias Et Al → Hampton No 45; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bell Douglas-Casset Bias Et Al → Laurel Coal Corp; 1987-10-01 to 1993-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → Hampton No 45; 1993-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1993-12-21 to current/open; source msha-controller-operator-history