# Relationship history for MSHA mine 4604765

Current hierarchy: **Campbell Resources Inc → Coal Corp Of America Inc → Greenbrier Surface #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

- **controller_controls_mine:** Gould Inc → Greenbrier Surface #2; 1950-01-01 to 1987-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Gould Mines Inc → Greenbrier Surface #2; 1975-07-12 to 1984-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Gould Inc → Gould Mines Inc; 1975-07-12 to 1984-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Resources Inc → Greenbrier Surface #2; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Coal Mining Of W Va Inc → Greenbrier Surface #2; 1984-07-25 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Young James W → Greenbrier Surface #2; 1984-07-25 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Young James W → Southern Coal Mining Of W Va Inc; 1984-07-25 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Rex  Greer et al → Greenbrier Surface #2; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E G & S Mining Inc → Greenbrier Surface #2; 1985-07-10 to 1987-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Greer et al → E G & S Mining Inc; 1985-07-10 to 1987-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Greer et al → E G & S Mining Inc; 1985-07-10 to 1987-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Coal Corp Of America Inc → Greenbrier Surface #2; 1987-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Resources Inc → Coal Corp Of America Inc; 1987-04-15 to current/open; source msha-controller-operator-history