# Relationship history for MSHA mine 4406046

Current hierarchy: **Westmoreland Coal Company → Westmoreland Coal Company → Yankee Plant**

- 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 → Yankee Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yankee Processing Corp → Yankee Plant; 1983-12-01 to 1988-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Fraley Jerry L → Yankee Plant; 1983-12-01 to 1988-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Fraley Jerry L → Yankee Processing Corp; 1983-12-01 to 1988-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → Yankee Plant; 1988-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1988-10-04 to current/open; source msha-controller-operator-history