# Relationship history for MSHA mine 4104842

Current hierarchy: **Norvarem S A U → Southern Crushed Concrete → Southern Crushed Concrete 1**

- 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:** Southern Crushed Concrete → Southern Crushed Concrete 1; 2010-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norvarem S A U → Southern Crushed Concrete 1; 2010-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norvarem S A U → Southern Crushed Concrete; 2010-10-25 to current/open; source msha-controller-operator-history