# Relationship history for MSHA mine 1001489

Current hierarchy: **Donnenwirth Charles M → Donnenwirth Company → Master Mine #1**

- 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:** Donnenwirth Company → Master Mine #1; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donnenwirth Charles M → Master Mine #1; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donnenwirth Charles M → Donnenwirth Company; 1980-07-01 to current/open; source msha-controller-operator-history