# Relationship history for MSHA mine 4500640

Current hierarchy: **CRH PLC → Inland Asphalt Company → Sullivan Pit**

- 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:** Inland Asphalt Company → Sullivan Pit; 1950-01-01 to 1983-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Carroll R M → Sullivan Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carroll R M → Inland Asphalt Company; 1950-01-01 to 1983-05-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Sullivan Pit; 1983-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Inland Asphalt Company → Sullivan Pit; 1983-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Inland Asphalt Company; 1983-05-31 to current/open; source msha-controller-operator-history