# Relationship history for MSHA mine 4406124

Current hierarchy: **MAPCO Inc → Race Fork Coal Corp → Strip #10**

- 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:** South Atlantic Coal Company Inc → Strip #10; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Race Fork Coal Corp → Strip #10; 1984-09-01 to 1989-10-24; source msha-controller-operator-history
- **controller_controls_operator:** South Atlantic Coal Company Inc → Race Fork Coal Corp; 1984-09-01 to 1989-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Race Fork Coal Corp → Strip #10; 1989-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MAPCO Inc → Strip #10; 1989-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MAPCO Inc → Race Fork Coal Corp; 1989-10-25 to current/open; source msha-controller-operator-history