# Relationship history for MSHA mine 4105468

Current hierarchy: **Ryan  Harrison; Aaron  Cabaza → Aaron Concrete → Berclair Pit**

- 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:** Aaron Concrete → Berclair Pit; 2019-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aaron  Cabaza et al → Berclair Pit; 2019-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Cabaza et al → Aaron Concrete; 2019-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Harrison et al → Aaron Concrete; 2019-10-01 to current/open; source msha-controller-operator-history