# Relationship history for MSHA mine 4607645

Current hierarchy: **Fay E  Leydig → Philippi Mining Company → Philippi Mining Co**

- 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

- **controller_controls_mine:** Fay E  Leydig → Philippi Mining Co; 1987-03-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Philippi Mining Company → Philippi Mining Co; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fay E  Leydig → Philippi Mining Company; 1989-01-01 to current/open; source msha-controller-operator-history