# Relationship history for MSHA mine 4701710

Current hierarchy: **Roderick C Hopkins → Hopkins Sand & Gravel → Carlsborg Washplant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Roderick C Hopkins et al → Carlsborg Washplant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Sonnentag et al → Carlsborg Washplant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Webster Concrete Products → Carlsborg Washplant; 1950-01-01 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Charles D  Bruss → Carlsborg Washplant; 1950-01-01 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Bruss → Webster Concrete Products; 1950-01-01 to 1991-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Webster Concrete Inc → Carlsborg Washplant; 1991-07-01 to 2000-10-10; source msha-controller-operator-history
- **controller_controls_mine:** Kathleen J  Bruss et al → Carlsborg Washplant; 1991-07-01 to 2000-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen J  Bruss et al → Webster Concrete Inc; 1991-07-01 to 2000-10-10; source msha-controller-operator-history
- **operator_operates_mine:** County Concrete Corp → Carlsborg Washplant; 2000-10-11 to 2005-05-24; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Sonnentag et al → County Concrete Corp; 2000-10-11 to 2005-05-24; source msha-controller-operator-history
- **operator_operates_mine:** County Materials Corp → Carlsborg Washplant; 2005-05-25 to 2008-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Sonnentag et al → Carlsborg Washplant; 2005-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Sonnentag et al → County Materials Corp; 2005-05-25 to 2008-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Hopkins Sand & Gravel → Carlsborg Washplant; 2008-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roderick C Hopkins et al → Hopkins Sand & Gravel; 2008-05-01 to current/open; source msha-controller-operator-history