# Relationship history for MSHA mine 4603488

Current hierarchy: **American Electric Power Company Inc → Cedar Coal Company → Robin No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** American Electric Power Company Inc → Robin No 3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Expansion Coal Co → Robin No 3 Mine; 1950-01-01 to 1974-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Expansion Coal Co → Robin No 3 Mine; 1950-01-01 to 1974-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Expansion Coal Co → Expansion Coal Co; 1950-01-01 to 1974-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Coal Company → Robin No 3 Mine; 1974-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Electric Power Company Inc → Cedar Coal Company; 1974-04-01 to current/open; source msha-controller-operator-history