# Relationship history for MSHA mine 4602499

Current hierarchy: **Rogers Odell → Wedgewood Coal Corp → No 1 Surface**

- 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:** Elkay Mining Company → No 1 Surface; 1950-01-01 to 1974-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Elkay Mining Company; 1950-01-01 to 1974-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Wedgewood Coal Corp → No 1 Surface; 1974-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Odell → No 1 Surface; 1974-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Odell → Wedgewood Coal Corp; 1974-09-11 to current/open; source msha-controller-operator-history