# Relationship history for MSHA mine 3901637

Current hierarchy: **GCC SAB de CV → Consolidated Ready Mix → WASH-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:** GCC SAB de CV → WASH-PLANT; 2006-01-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Consolidated Ready Mix → WASH-PLANT; 2019-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → Consolidated Ready Mix; 2019-04-04 to current/open; source msha-controller-operator-history