# Relationship history for MSHA mine 4104902

Current hierarchy: **Paul  Walker → Hardin-Walker Development Inc → Krause Caliche 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Paul  Walker → Krause Caliche Pit; 2011-05-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hardin-Walker Development Inc → Krause Caliche Pit; 2011-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Walker → Hardin-Walker Development Inc; 2011-10-14 to current/open; source msha-controller-operator-history