# Relationship history for MSHA mine 3000022

Current hierarchy: **CRH PLC → DOLOMITE GROUP → BROCKPORT PLANT**

- 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:** Concrete Materials Inc → BROCKPORT PLANT; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Hague Peter R → BROCKPORT PLANT; 1950-01-01 to 1986-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Hague Peter R → Concrete Materials Inc; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Iroquois Rock Products → BROCKPORT PLANT; 1986-04-01 to 2000-06-13; source msha-controller-operator-history
- **controller_controls_mine:** John M  Odenbach → BROCKPORT PLANT; 1986-04-01 to 2000-06-13; source msha-controller-operator-history
- **controller_controls_operator:** John M  Odenbach → Iroquois Rock Products; 1986-04-01 to 2000-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Iroquois Rock Products → BROCKPORT PLANT; 2000-06-14 to 2002-09-08; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → BROCKPORT PLANT; 2000-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Iroquois Rock Products; 2000-06-14 to 2002-09-08; source msha-controller-operator-history
- **operator_operates_mine:** DOLOMITE GROUP → BROCKPORT PLANT; 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