# Relationship history for MSHA mine 3901643

Current hierarchy: **Joseph R  Benthin → Benthin Blading → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Benthin Blading → Portable 1; 2019-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph R  Benthin → Portable 1; 2019-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph R  Benthin → Benthin Blading; 2019-10-14 to current/open; source msha-controller-operator-history