# Relationship history for MSHA mine 3603107

Current hierarchy: **John W  Rich (Pa) → Gilberton Coal Company → Locust Summit Fine Coal Plant**

- 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:** Gilberton Coal Company → Locust Summit Fine Coal Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Rich (Pa) → Locust Summit Fine Coal Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich (Pa) → Gilberton Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history