# Relationship history for MSHA mine 3003460

Current hierarchy: **Roger S  Rommel → POLAND  SAND & GRAVEL LLC → POLAND 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

- **operator_operates_mine:** POLAND  SAND & GRAVEL LLC → POLAND SAND & GRAVEL; 2004-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger S  Rommel → POLAND SAND & GRAVEL; 2004-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger S  Rommel → POLAND  SAND & GRAVEL LLC; 2004-02-09 to current/open; source msha-controller-operator-history