# Relationship history for MSHA mine 1512163

Current hierarchy: **Earley William G → W C S Inc → No 4**

- 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:** Curry Mining Corp → No 4; 1979-12-01 to 1980-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Curry Roy → No 4; 1979-12-01 to 1985-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Curry Roy → Curry Mining Corp; 1979-12-01 to 1980-07-10; source msha-controller-operator-history
- **operator_operates_mine:** H J Mining Company Inc → No 4; 1980-07-11 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Schwab Charles F → No 4; 1980-07-11 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Schwab Charles F → H J Mining Company Inc; 1980-07-11 to 1983-06-23; source msha-controller-operator-history
- **operator_operates_mine:** W C S Inc → No 4; 1983-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Earley William G → No 4; 1983-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earley William G → W C S Inc; 1983-06-24 to current/open; source msha-controller-operator-history