# Relationship history for MSHA mine 2002872

Current hierarchy: **Benzie County-Mi → Benzie County Road Commission → BARBER GREEN PLANT #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:** Benzie County Road Commission → BARBER GREEN PLANT #1; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benzie County-Mi → BARBER GREEN PLANT #1; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benzie County-Mi → Benzie County Road Commission; 1992-04-01 to current/open; source msha-controller-operator-history