# Relationship history for MSHA mine 4001197

Current hierarchy: **Roger E  West → Imperial Coals Inc → 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

- **operator_operates_mine:** Tri Mining Company → Mine No 2; 1950-01-01 to 1981-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Parton Franklin M & W R Jr → Mine No 2; 1950-01-01 to 1981-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Parton Franklin M & W R Jr → Tri Mining Company; 1950-01-01 to 1981-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Roger E  West → Mine No 2; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Imperial Coals Inc → Mine No 2; 1981-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Imperial Coals Inc; 1981-12-15 to current/open; source msha-controller-operator-history