# Relationship history for MSHA mine 4405045

Current hierarchy: **Westmoreland Coal Company → Westmoreland Coal Company → Imboden 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

- **controller_controls_mine:** Westmoreland Coal Company → Imboden Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coalbarb Energy Corp → Imboden Tipple; 1978-05-01 to 1988-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Fraley Jerry L → Imboden Tipple; 1978-05-01 to 1988-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Fraley Jerry L → Coalbarb Energy Corp; 1978-05-01 to 1988-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → Imboden Tipple; 1988-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1988-07-11 to current/open; source msha-controller-operator-history