# Relationship history for MSHA mine 4607243

Current hierarchy: **Westmoreland Coal Company → Westmoreland Coal Company → Hampton No 41 Mine**

- 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 41 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rockhouse Energy & Development Inc → Hampton No 41 Mine; 1986-12-01 to 1987-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Chaffin Clyde L Jr → Hampton No 41 Mine; 1986-12-01 to 1987-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Chaffin Clyde L Jr → Rockhouse Energy & Development Inc; 1986-12-01 to 1987-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → Hampton No 41 Mine; 1987-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1987-11-18 to current/open; source msha-controller-operator-history