# Relationship history for MSHA mine 4201658

Current hierarchy: **Shepherd Ronald L → Barex Corp → Barex Lindon Plant Or Barex Corp Mill**

- 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:** Barex Corp → Barex Lindon Plant Or Barex Corp Mill; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shepherd Ronald L → Barex Lindon Plant Or Barex Corp Mill; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shepherd Ronald L → Barex Corp; 1980-03-01 to current/open; source msha-controller-operator-history