# Relationship history for MSHA mine 4603293

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Stirrat Coal Company → Repair Shop**

- 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:** W-P Coal Company → Repair Shop; 1950-01-01 to 1993-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Wheeling-Pittsburgh Corp → Repair Shop; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wheeling-Pittsburgh Corp → W-P Coal Company; 1950-01-01 to 1993-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Stirrat Coal Company → Repair Shop; 1993-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Repair Shop; 1993-11-15 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Stirrat Coal Company; 1993-11-15 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Repair Shop; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Stirrat Coal Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Repair Shop; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Stirrat Coal Company; 2016-07-26 to current/open; source msha-controller-operator-history