# Relationship history for MSHA mine 1502619

Current hierarchy: **Preece John H → A K P Coal Company Inc → Mine No 34**

- 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:** A K P Coal Company Inc → Mine No 34; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Preece John H → Mine No 34; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Preece John H → A K P Coal Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history