# Relationship history for MSHA mine 3608429

Current hierarchy: **Zamagias Michael G → Greensburg Zamagias Ltd Partner → Greensburg Plaza**

- 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:** Greensburg Zamagias Ltd Partner → Greensburg Plaza; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zamagias Michael G → Greensburg Plaza; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zamagias Michael G → Greensburg Zamagias Ltd Partner; 1993-09-01 to current/open; source msha-controller-operator-history