# Relationship history for MSHA mine 3503044

Current hierarchy: **CRH PLC → RiverBend Materials → RiverBend Materials Bethel**

- 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:** J C Compton Company → RiverBend Materials Bethel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → RiverBend Materials Bethel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Freeman & Sons → RiverBend Materials Bethel; 1981-01-01 to 1997-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Gerald Colyer  Freeman  et al → RiverBend Materials Bethel; 1981-01-01 to 1997-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Gerald Colyer  Freeman  et al → Freeman & Sons; 1981-01-01 to 1997-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Quality Sand & Gravel Inc → RiverBend Materials Bethel; 1997-03-12 to 2002-03-11; source msha-controller-operator-history
- **controller_controls_mine:** William R  Steiner → RiverBend Materials Bethel; 1997-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William R  Steiner → Quality Sand & Gravel Inc; 1997-03-12 to 2002-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Valley Concrete & Gravel Co. → RiverBend Materials Bethel; 2002-03-12 to 2006-06-30; source msha-controller-operator-history
- **controller_controls_operator:** J C Compton Company → Valley Concrete & Gravel Co.; 2002-03-12 to 2006-06-30; source msha-controller-operator-history
- **operator_operates_mine:** RiverBend Materials → RiverBend Materials Bethel; 2006-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → RiverBend Materials; 2006-07-01 to current/open; source msha-controller-operator-history