# Relationship history for MSHA mine 0504196

Current hierarchy: **Raul  Vasquez → Blue Mt Stone → Barnard 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:** Blue Mt Stone → Barnard Quarry; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raul  Vasquez → Barnard Quarry; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raul  Vasquez → Blue Mt Stone; 1987-01-01 to current/open; source msha-controller-operator-history