# Relationship history for MSHA mine 1507932

Current hierarchy: **Ogden C Bruce → Double 001 Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Century Fuels Inc → No 1 Strip; 1974-01-01 to 1975-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Powell Walter Jr → No 1 Strip; 1974-01-01 to 1975-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Powell Walter Jr → Century Fuels Inc; 1974-01-01 to 1975-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Double 001 Inc → No 1 Strip; 1975-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ogden C Bruce → No 1 Strip; 1975-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ogden C Bruce → Double 001 Inc; 1975-05-02 to current/open; source msha-controller-operator-history