# Relationship history for MSHA mine 1508169

Current hierarchy: **Day Walter W → Hitchens Bituminous Coals Ltd → No 1 Tipple**

- 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:** P & O Mining Company Inc → No 1 Tipple; 1975-03-28 to 1980-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Prichard Larry S → No 1 Tipple; 1975-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prichard Larry S → P & O Mining Company Inc; 1975-03-28 to 1980-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Hitchens Bituminous Coals Ltd → No 1 Tipple; 1980-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Day Walter W → No 1 Tipple; 1980-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Day Walter W → Hitchens Bituminous Coals Ltd; 1980-01-21 to current/open; source msha-controller-operator-history