# Relationship history for MSHA mine 1512256

Current hierarchy: **Pendleton Eugene → Mountain Ridge Mining Inc → No 4**

- 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:** Evarts Mining Company Inc → No 4; 1980-03-01 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Christian John H → No 4; 1980-03-01 to 1980-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Christian John H → Evarts Mining Company Inc; 1980-03-01 to 1980-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Evarts Mining Company Inc → No 4; 1980-10-20 to 1984-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Cochran Lloyd Et Al → No 4; 1980-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cochran Lloyd Et Al → Evarts Mining Company Inc; 1980-10-20 to 1984-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Gregory Sr. → No 4; 1983-03-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cross Over Mining Company Inc → No 4; 1984-01-13 to 1984-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Gregory Sr. → Cross Over Mining Company Inc; 1984-01-13 to 1984-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Calvin Mining Company → No 4; 1984-03-15 to 1985-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Woliver Bill → No 4; 1984-03-15 to 1985-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Woliver Bill → Calvin Mining Company; 1984-03-15 to 1985-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Ollie Et Al → No 4; 1985-01-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cross Over Mining Company Inc → No 4; 1985-02-25 to 1985-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Gregory Sr. → Cross Over Mining Company Inc; 1985-02-25 to 1985-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Newcoal Inc → No 4; 1985-05-06 to 1989-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Ollie Et Al → Newcoal Inc; 1985-05-06 to 1989-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Pendleton Eugene → No 4; 1989-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Ridge Mining Inc → No 4; 1989-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pendleton Eugene → Mountain Ridge Mining Inc; 1989-09-26 to current/open; source msha-controller-operator-history