# Relationship history for MSHA mine 4105123

Current hierarchy: **Steven Bradley  Adam → B & C Rock Source → B & C Rock Quarry**

- 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:** B & C Rock Source → B & C Rock Quarry; 2015-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steven Bradley  Adam → B & C Rock Quarry; 2015-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven Bradley  Adam → B & C Rock Source; 2015-04-14 to current/open; source msha-controller-operator-history