# Relationship history for MSHA mine 2302430

Current hierarchy: **Colas S A → Southeast Missouri Stone → Dexter Sand & Gravel**

- 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

- **controller_controls_mine:** Colas S A → Dexter Sand & Gravel; 1993-01-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southeast Missouri Stone → Dexter Sand & Gravel; 2012-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Southeast Missouri Stone; 2012-02-10 to current/open; source msha-controller-operator-history