# Relationship history for MSHA mine 3003951

Current hierarchy: **Louis J  Grausso → Huntington Ready Mixed Concrete Inc → HUNTINGTON READY MIX**

- 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:** Huntington Ready Mixed Concrete Inc → HUNTINGTON READY MIX; 2015-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Louis J  Grausso → HUNTINGTON READY MIX; 2015-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louis J  Grausso → Huntington Ready Mixed Concrete Inc; 2015-05-19 to current/open; source msha-controller-operator-history