# Relationship history for MSHA mine 2800490

Current hierarchy: **CRH PLC → Tilcon New York Inc → CERTIFIED 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Certified Aggregates Company Inc → CERTIFIED QUARRY; 1950-01-01 to 1984-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Thomas V  Wade → CERTIFIED QUARRY; 1950-01-01 to 1984-08-12; source msha-controller-operator-history
- **controller_controls_operator:** Thomas V  Wade → Certified Aggregates Company Inc; 1950-01-01 to 1984-08-12; source msha-controller-operator-history
- **controller_controls_mine:** R A Hamilton Corp → CERTIFIED QUARRY; 1980-01-01 to 1994-09-05; source msha-controller-operator-history
- **operator_operates_mine:** R A Hamilton Corp → CERTIFIED QUARRY; 1984-08-13 to 1994-09-05; source msha-controller-operator-history
- **controller_controls_operator:** R A Hamilton Corp → R A Hamilton Corp; 1984-08-13 to 1994-09-05; source msha-controller-operator-history
- **operator_operates_mine:** Certified Aggregates → CERTIFIED QUARRY; 1994-09-06 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Anthony J  Dellechiaie → CERTIFIED QUARRY; 1994-09-06 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Anthony J  Dellechiaie → Certified Aggregates; 1994-09-06 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → CERTIFIED QUARRY; 1996-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon New York Inc → CERTIFIED QUARRY; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Tilcon New York Inc; 1999-07-01 to current/open; source msha-controller-operator-history