# Relationship history for MSHA mine 1515417

Current hierarchy: **Kretzer Peggy A → Ampak Mining Inc → Ampak Mine #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:** Johnson Ralph → Ampak Mine #7; 1984-10-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Hills Mining Company Inc → Ampak Mine #7; 1985-10-01 to 1987-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ralph → Southern Hills Mining Company Inc; 1985-10-01 to 1987-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Southern Hills Mining Company Inc → Ampak Mine #7; 1987-08-20 to 1988-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Watts Marvin → Ampak Mine #7; 1987-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Watts Marvin → Southern Hills Mining Company Inc; 1987-08-20 to 1988-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Kretzer Peggy A → Ampak Mine #7; 1987-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ampak Mining Inc → Ampak Mine #7; 1988-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kretzer Peggy A → Ampak Mining Inc; 1988-07-11 to current/open; source msha-controller-operator-history