# Relationship history for MSHA mine 1102713

Current hierarchy: **Pennwalt Corp → Ozark-Mahoning Company → Henson Or Henson Shaft**

- 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

- **controller_controls_mine:** Pennwalt Corp → Henson Or Henson Shaft; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ozark-Mahoning Company → Henson Or Henson Shaft; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pennwalt Corp → Ozark-Mahoning Company; 1979-10-01 to current/open; source msha-controller-operator-history