# Relationship history for MSHA mine 0504502

Current hierarchy: **Ignacio  Vasquez Sr → Noland Stone → Lucio Vasquez Quarry 1**

- 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:** Noland Stone → Lucio Vasquez Quarry 1; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ignacio  Vasquez Sr → Lucio Vasquez Quarry 1; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ignacio  Vasquez Sr → Noland Stone; 1992-08-01 to current/open; source msha-controller-operator-history