# Relationship history for MSHA mine 4603892

Current hierarchy: **Williams Ireland → Rocky Branch Coal Inc → Greenbrier 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Gould Mines Inc → Greenbrier Strip; 1950-01-01 to 1983-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Gould Inc → Greenbrier Strip; 1950-01-01 to 1987-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Gould Inc → Gould Mines Inc; 1950-01-01 to 1983-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Gould Inc → Greenbrier Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Resources Inc → Greenbrier Strip; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rader Run Coal Corp → Greenbrier Strip; 1983-05-06 to 1987-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Hunter Carl L → Greenbrier Strip; 1983-05-06 to 1987-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Hunter Carl L → Rader Run Coal Corp; 1983-05-06 to 1987-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Coal Corp Of America Inc → Greenbrier Strip; 1987-04-15 to 1990-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Resources Inc → Coal Corp Of America Inc; 1987-04-15 to 1990-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Low Ash Inc → Greenbrier Strip; 1990-08-03 to 1991-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Gould Inc → Low Ash Inc; 1990-08-03 to 1991-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Iroquois Coal Corp → Greenbrier Strip; 1991-07-15 to 1992-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Bowen Max → Greenbrier Strip; 1991-07-15 to 1992-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Bowen Max → Iroquois Coal Corp; 1991-07-15 to 1992-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Williams Ireland → Greenbrier Strip; 1992-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Branch Coal Inc → Greenbrier Strip; 1992-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Ireland → Rocky Branch Coal Inc; 1992-01-17 to current/open; source msha-controller-operator-history