# Relationship history for MSHA mine 1514414

Current hierarchy: **Robert M  Keen → M K Coal Company → Mine No 2**

- 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:** Christian Richard A → Mine No 2; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blu-Jel Coal Inc → Mine No 2; 1984-01-01 to 1984-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Christian Richard A → Blu-Jel Coal Inc; 1984-01-01 to 1984-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert M  Keen → Mine No 2; 1984-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M K Coal Company → Mine No 2; 1984-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert M  Keen → M K Coal Company; 1984-12-17 to current/open; source msha-controller-operator-history