# Relationship history for MSHA mine 2103623

Current hierarchy: **Kenneth O  Behrens → Behrens Custom Crushing → Schmidt Pit**

- 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:** Behrens Custom Crushing → Schmidt Pit; 2008-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth O  Behrens → Schmidt Pit; 2008-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth O  Behrens → Behrens Custom Crushing; 2008-05-29 to current/open; source msha-controller-operator-history