# Relationship history for MSHA mine 4606874

Current hierarchy: **Hunter Ernie → Double N Mining Inc → 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 → Surface #2; 1950-01-01 to 1987-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Resources Inc → Surface #2; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gould Mines Inc → Surface #2; 1985-06-01 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Gould Inc → Gould Mines Inc; 1985-06-01 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Greer et al → Surface #2; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E G & S Mining Inc → Surface #2; 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
- **controller_controls_operator:** Rex  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 → Surface #2; 1987-04-15 to 1992-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Resources Inc → Coal Corp Of America Inc; 1987-04-15 to 1992-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Hunter Ernie Et Al → Surface #2; 1989-10-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Double N Mining Inc → Surface #2; 1992-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hunter Ernie Et Al → Double N Mining Inc; 1992-10-26 to current/open; source msha-controller-operator-history