# Relationship history for MSHA mine 4002311

Current hierarchy: **Fletcher Marvin H Jr → Big Fork Mining Company Inc → Area No 7**

- 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 → Area No 7; 1975-11-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Teeco Coal Company → Area No 7; 1977-08-01 to 1979-06-25; source msha-controller-operator-history
- **controller_controls_mine:** U S Natural Resources Inc → Area No 7; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Natural Resources Inc → Teeco Coal Company; 1977-08-01 to 1979-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Big Fork Mining Company Inc → Area No 7; 1979-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Marvin H Jr → Big Fork Mining Company Inc; 1979-06-26 to current/open; source msha-controller-operator-history