# Relationship history for MSHA mine 4603116

Current hierarchy: **Stokely Roy → Coal Recovery Inc → No 4 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

- **operator_operates_mine:** Westmoreland Coal Company → No 4 Tipple; 1950-01-01 to 1974-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → No 4 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1950-01-01 to 1974-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Coal Recovery Inc → No 4 Tipple; 1974-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stokely Roy → No 4 Tipple; 1974-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stokely Roy → Coal Recovery Inc; 1974-03-04 to current/open; source msha-controller-operator-history