# Relationship history for MSHA mine 4103343

Current hierarchy: **Bryant Bobby → Associated Crushed Stone → Rio Vista Pit & Plant**

- 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

- **controller_controls_mine:** Bryant Bobby → Rio Vista Pit & Plant; 1985-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Associated Crushed Stone → Rio Vista Pit & Plant; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryant Bobby → Associated Crushed Stone; 1985-10-01 to current/open; source msha-controller-operator-history