# Relationship history for MSHA mine 1511272

Current hierarchy: **Francis Robert L → Barbara Kay Coal Corp → No 2 Mine (D)**

- 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:** Francis Robert L → No 2 Mine (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barbara Kay Coal Corp → No 2 Mine (D); 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis Robert L → Barbara Kay Coal Corp; 1978-05-01 to current/open; source msha-controller-operator-history