# Relationship history for MSHA mine 0504601

Current hierarchy: **Arthur  Vasquez → O and A 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Beach Hill Co-Op → BARNARD QUARRY; 1997-07-01 to 2000-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Leo  Perdue → BARNARD QUARRY; 1997-07-01 to 2000-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Leo  Perdue → Beach Hill Co-Op; 1997-07-01 to 2000-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Randy Perdue Trucking & Flagstone Sales → BARNARD QUARRY; 2000-03-31 to 2001-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Perdue → BARNARD QUARRY; 2000-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Perdue → Randy Perdue Trucking & Flagstone Sales; 2000-03-31 to 2001-11-07; source msha-controller-operator-history
- **operator_operates_mine:** O and A Stone → BARNARD QUARRY; 2001-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur  Vasquez → BARNARD QUARRY; 2001-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur  Vasquez → O and A Stone; 2001-11-08 to current/open; source msha-controller-operator-history