# Relationship history for MSHA mine 0400021

Current hierarchy: **CRH PLC → Dutra Materials → San Rafael Rock Quarry**

- 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

- **operator_operates_mine:** Basalt Rock Div-Dillingham Heavy Const Inc → San Rafael Rock Quarry; 1950-01-01 to 1986-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Dillingham Construction Corp → San Rafael Rock Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dillingham Construction Corp → Basalt Rock Div-Dillingham Heavy Const Inc; 1950-01-01 to 1986-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Dutra Materials → San Rafael Rock Quarry; 1986-05-12 to 2024-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Bill T  Dutra → San Rafael Rock Quarry; 1986-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill T  Dutra → Dutra Materials; 1986-05-12 to 2024-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Dean  Soiland → San Rafael Rock Quarry; 1989-04-01 to 2024-04-04; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → San Rafael Rock Quarry; 2024-04-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dutra Materials → San Rafael Rock Quarry; 2024-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Dutra Materials; 2024-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean  Soiland → Dutra Materials; 2024-11-15 to 2024-04-04; source msha-controller-operator-history