# Relationship history for MSHA mine 4602120

Current hierarchy: **American Electric Power Company Inc → Southern Appalachian Coal Company → Cedar Grove No 1 Mine**

- 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:** American Electric Power Company Inc → Cedar Grove No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ferndale Coal Corp → Cedar Grove No 1 Mine; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ferndale Coal Corp → Cedar Grove No 1 Mine; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ferndale Coal Corp → Ferndale Coal Corp; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Southern Appalachian Coal Company → Cedar Grove No 1 Mine; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Electric Power Company Inc → Southern Appalachian Coal Company; 1973-01-01 to current/open; source msha-controller-operator-history