# Relationship history for MSHA mine 4502664

Current hierarchy: **Carbon Carl Jr → Carl Carbon Inc → United Paving 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

- **controller_controls_mine:** Carbon Carl Jr → United Paving Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carl Carbon Inc → United Paving Quarry; 1979-01-01 to 1979-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Carbon Carl Jr → Carl Carbon Inc; 1979-01-01 to 1979-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Yardley Drilling Company Inc → United Paving Quarry; 1979-10-31 to 1980-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Messenger Virgil → United Paving Quarry; 1979-10-31 to 1980-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Messenger Virgil → Yardley Drilling Company Inc; 1979-10-31 to 1980-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Carl Carbon Inc → United Paving Quarry; 1980-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carbon Carl Jr → Carl Carbon Inc; 1980-12-10 to current/open; source msha-controller-operator-history