# Relationship history for MSHA mine 1002328

Current hierarchy: **Blaine County-ID → Blaine County Road & Bridge → Portable 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:** Blaine County Road & Bridge → Portable 1; 2021-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blaine County-ID → Portable 1; 2021-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blaine County-ID → Blaine County Road & Bridge; 2021-01-20 to current/open; source msha-controller-operator-history