# Relationship history for MSHA mine 1504628

Current hierarchy: **Rogers Odell → Yankee Coal Company Inc → No 1 Surface 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

- **operator_operates_mine:** Appalachian Fuel & Land Company → No 1 Surface Mine; 1950-01-01 to 1975-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Appalachian Fuel & Land Company → No 1 Surface Mine; 1950-01-01 to 1975-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Appalachian Fuel & Land Company → Appalachian Fuel & Land Company; 1950-01-01 to 1975-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Yankee Coal Company Inc → No 1 Surface Mine; 1975-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Odell → No 1 Surface Mine; 1975-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Odell → Yankee Coal Company Inc; 1975-02-20 to current/open; source msha-controller-operator-history