# Relationship history for MSHA mine 4002805

Current hierarchy: **Fletcher Marvin H Jr → Big Fork Mining Company Inc → Big Fork Mining Area #11**

- 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:** Fletcher Marvin H Jr → Big Fork Mining Area #11; 1975-11-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Fork Mining Company Inc → Big Fork Mining Area #11; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Marvin H Jr → Big Fork Mining Company Inc; 1982-09-01 to current/open; source msha-controller-operator-history