# Relationship history for MSHA mine 3700231

Current hierarchy: **Matthew T Kobyluck → Kobyluck Enterprises Inc. → KEI Contract Crushing**

- 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:** Kobyluck Enterprises Inc. → KEI Contract Crushing; 2018-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew T Kobyluck → KEI Contract Crushing; 2018-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew T Kobyluck → Kobyluck Enterprises Inc.; 2018-03-27 to current/open; source msha-controller-operator-history