# Relationship history for MSHA mine 3610163

Current hierarchy: **Michael A  Cook → Mike Cook Stone Quarry → Mike Cook Quarry -  Portable (West)**

- 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:** Mike Cook Stone Quarry → Mike Cook Quarry -  Portable (West); 2015-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael A  Cook → Mike Cook Quarry -  Portable (West); 2015-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Cook → Mike Cook Stone Quarry; 2015-10-22 to current/open; source msha-controller-operator-history