# Relationship history for MSHA mine 3608587

Current hierarchy: **Dziak Michael A → Earth Conservancy → Earth Conservancy**

- 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:** Earth Conservancy → Earth Conservancy; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dziak Michael A → Earth Conservancy; 1996-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dziak Michael A → Earth Conservancy; 1996-10-01 to current/open; source msha-controller-operator-history