# Relationship history for MSHA mine 4601395

Current hierarchy: **Mc Coy John P → Excalibur Coal Company Inc → No 19c**

- 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

- **operator_operates_mine:** W-P Coal Company → No 19c; 1950-01-01 to 1980-07-06; source msha-controller-operator-history
- **controller_controls_mine:** Wheeling-Pittsburgh Corp → No 19c; 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 1980-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Priority Coal Corp → No 19c; 1980-07-07 to 1981-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Robert → No 19c; 1980-07-07 to 1981-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Robert → Priority Coal Corp; 1980-07-07 to 1981-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Excalibur Coal Company Inc → No 19c; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Coy John P → No 19c; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Coy John P → Excalibur Coal Company Inc; 1981-09-01 to current/open; source msha-controller-operator-history