# Relationship history for MSHA mine 4105504

Current hierarchy: **Mayfield  Mc Craw → McCraw Materials → Ambrose**

- 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

- **controller_controls_mine:** Mayfield  Mc Craw → Ambrose; 1999-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McCraw Materials → Ambrose; 2020-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mayfield  Mc Craw → McCraw Materials; 2020-05-20 to current/open; source msha-controller-operator-history