# Relationship history for MSHA mine 4002389

Current hierarchy: **Fletcher Marvin H Jr → Big Fork Mining Company Inc → Area No 4 Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Fletcher Marvin H Jr → Area No 4 Strip; 1975-11-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Fork Mining Company Inc → Area No 4 Strip; 1977-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Marvin H Jr → Big Fork Mining Company Inc; 1977-12-01 to current/open; source msha-controller-operator-history