# Relationship history for MSHA mine 0504721

Current hierarchy: **Ignacio  Vasquez Sr → Noland Stone → Ignacio Vasquez Sr**

- 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

- **controller_controls_mine:** Ignacio  Vasquez Sr → Ignacio Vasquez Sr; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Perdue → Ignacio Vasquez Sr; 2000-03-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Randy Perdue Trucking & Flagstone Sales → Ignacio Vasquez Sr; 2000-10-01 to 2006-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Perdue → Randy Perdue Trucking & Flagstone Sales; 2000-10-01 to 2006-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Noland Stone → Ignacio Vasquez Sr; 2006-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ignacio  Vasquez Sr → Noland Stone; 2006-05-07 to current/open; source msha-controller-operator-history