# Relationship history for MSHA mine 3002800

Current hierarchy: **CRH PLC → DOLOMITE GROUP → LEROY - CIRCULAR HILL**

- 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:** John M  Odenbach → LEROY - CIRCULAR HILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northrup Concrete Inc → LEROY - CIRCULAR HILL; 1987-07-01 to 1997-08-10; source msha-controller-operator-history
- **controller_controls_mine:** James  Northrup → LEROY - CIRCULAR HILL; 1987-07-01 to 1997-08-10; source msha-controller-operator-history
- **controller_controls_operator:** James  Northrup → Northrup Concrete Inc; 1987-07-01 to 1997-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Dolomite Products Company Inc → LEROY - CIRCULAR HILL; 1997-08-11 to 2000-06-13; source msha-controller-operator-history
- **controller_controls_operator:** John M  Odenbach → Dolomite Products Company Inc; 1997-08-11 to 2000-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Dolomite Products Company Inc → LEROY - CIRCULAR HILL; 2000-06-14 to 2002-09-08; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → LEROY - CIRCULAR HILL; 2000-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Dolomite Products Company Inc; 2000-06-14 to 2002-09-08; source msha-controller-operator-history
- **operator_operates_mine:** DOLOMITE GROUP → LEROY - CIRCULAR HILL; 2002-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → DOLOMITE GROUP; 2002-09-09 to current/open; source msha-controller-operator-history