# Relationship history for MSHA mine 1504353

Current hierarchy: **Phil  Young → Phil Young Mining Company → No 1 Strip**

- 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:** Bowlin Coal Company → No 1 Strip; 1950-01-01 to 1973-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Bowlin Farris → No 1 Strip; 1950-01-01 to 1973-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Bowlin Farris → Bowlin Coal Company; 1950-01-01 to 1973-07-01; source msha-controller-operator-history
- **operator_operates_mine:** Phil Young Mining Company → No 1 Strip; 1973-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phil  Young → No 1 Strip; 1973-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phil  Young → Phil Young Mining Company; 1973-07-02 to current/open; source msha-controller-operator-history