# Relationship history for MSHA mine 3503729

Current hierarchy: **David M  Larson → Larson Const. Co. → Kilchis Quarry**

- 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:** Larson Const. Co. → Kilchis Quarry; 2009-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M  Larson → Kilchis Quarry; 2009-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Larson → Larson Const. Co.; 2009-12-14 to current/open; source msha-controller-operator-history