# Relationship history for MSHA mine 0405172

Current hierarchy: **Sharon  McLaughlin → All Rock → All Rock**

- 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:** All Rock → All Rock; 1992-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gene  Mc Laughlin → All Rock; 1992-02-01 to 2016-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Gene  Mc Laughlin → All Rock; 1992-02-01 to 2016-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Sharon  McLaughlin → All Rock; 2016-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharon  McLaughlin → All Rock; 2016-04-11 to current/open; source msha-controller-operator-history