# Relationship history for MSHA mine 3001141

Current hierarchy: **CRH PLC → Dolomite Group → Ogden 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

- **controller_controls_mine:** John M  Odenbach → Ogden Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Manitou Sand & Gravel Company Inc → Ogden Plant; 1950-01-01 to 1999-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Walter F  Przybycien → Ogden Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter F  Przybycien → Manitou Sand & Gravel Company Inc; 1950-01-01 to 1999-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Dolomite Products Company Inc → Ogden Plant; 1999-02-16 to 2000-06-13; source msha-controller-operator-history
- **controller_controls_operator:** John M  Odenbach → Dolomite Products Company Inc; 1999-02-16 to 2000-06-13; source msha-controller-operator-history
- **operator_operates_mine:** DOLOMITE PRODUCTS COMPANY INC → Ogden Plant; 2000-06-14 to 2010-10-04; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ogden Plant; 2000-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → DOLOMITE PRODUCTS COMPANY INC; 2000-06-14 to 2010-10-04; source msha-controller-operator-history
- **operator_operates_mine:** Dolomite Group → Ogden Plant; 2010-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Dolomite Group; 2010-10-05 to current/open; source msha-controller-operator-history