# Relationship history for MSHA mine 1517439

Current hierarchy: **Johnson Matthew → Irishman Elkhorn Mining Company Inc → #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

- **operator_operates_mine:** Big Branch Mining Inc → #2; 1993-08-01 to 1994-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Moore → #2; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Moore → Big Branch Mining Inc; 1993-08-01 to 1994-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Irishman Elkhorn Mining Company Inc → #2; 1994-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Matthew → #2; 1994-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Matthew → Irishman Elkhorn Mining Company Inc; 1994-02-14 to current/open; source msha-controller-operator-history