# Relationship history for MSHA mine 1511759

Current hierarchy: **Zweifel Paul → A Z T Coal Mining Company Inc → Magnum #19 Prep Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Morgan Mining Inc → Magnum #19 Prep Plant; 1979-02-01 to 1979-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Morgan → Magnum #19 Prep Plant; 1979-02-01 to 1979-09-17; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Morgan → Morgan Mining Inc; 1979-02-01 to 1979-09-17; source msha-controller-operator-history
- **operator_operates_mine:** Seth Coal Inc → Magnum #19 Prep Plant; 1979-09-18 to 1981-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Hopkins Bill → Magnum #19 Prep Plant; 1979-09-18 to 1981-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Hopkins Bill → Seth Coal Inc; 1979-09-18 to 1981-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Gold Star Coal Company Inc → Magnum #19 Prep Plant; 1981-06-22 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Martin Don → Magnum #19 Prep Plant; 1981-06-22 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Martin Don → Gold Star Coal Company Inc; 1981-06-22 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Zweifel Paul → Magnum #19 Prep Plant; 1982-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A Z T Coal Mining Company Inc → Magnum #19 Prep Plant; 1983-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zweifel Paul → A Z T Coal Mining Company Inc; 1983-01-25 to current/open; source msha-controller-operator-history