# Relationship history for MSHA mine 4606375

Current hierarchy: **Hatfield Ewell & Marcus C → Cartesian Coal Company Inc → Cartesian I**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Wheeling-Pittsburgh Corp → Cartesian I; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W-P Coal Company → Cartesian I; 1981-08-01 to 1981-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Wheeling-Pittsburgh Corp → W-P Coal Company; 1981-08-01 to 1981-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Cartesian Coal Company Inc → Cartesian I; 1981-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hatfield Ewell & Marcus C → Cartesian I; 1981-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hatfield Ewell & Marcus C → Cartesian Coal Company Inc; 1981-11-05 to current/open; source msha-controller-operator-history