# Relationship history for MSHA mine 4105575

Current hierarchy: **Lubbock County-TX → Lubbock County → Lubbock County IRock Crusher**

- 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:** Lubbock County → Lubbock County IRock Crusher; 2021-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lubbock County-TX → Lubbock County IRock Crusher; 2021-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lubbock County-TX → Lubbock County; 2021-07-28 to current/open; source msha-controller-operator-history