# Relationship history for MSHA mine 3900268

Current hierarchy: **GCC SAB de CV → Consolidated Ready Mix Inc → CRM Sand & Gravel Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** B & B Concrete Inc → CRM Sand & Gravel Pit; 1950-01-01 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Bozied → CRM Sand & Gravel Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Bozied → B & B Concrete Inc; 1950-01-01 to 2005-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Consolidated Ready Mix Inc → CRM Sand & Gravel Pit; 2006-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** GCC SAB de CV → CRM Sand & Gravel Pit; 2006-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → Consolidated Ready Mix Inc; 2006-01-18 to current/open; source msha-controller-operator-history