# Relationship history for MSHA mine 4103882

Current hierarchy: **Cemex S A → CEMEX Construction Materials South, LLC → Blum 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Arnold Crushed Stone Inc → Blum Quarry; 1996-01-01 to 2023-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Michael B  Arnold → Blum Quarry; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael B  Arnold → Arnold Crushed Stone Inc; 1996-01-01 to 2023-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Blum Quarry; 2008-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CEMEX Construction Materials South, LLC → Blum Quarry; 2023-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → CEMEX Construction Materials South, LLC; 2023-03-30 to current/open; source msha-controller-operator-history