# Relationship history for MSHA mine 2402158

Current hierarchy: **Linda E  Myers → West End Sand & Gravel → WEST END 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:** West End Sand & Gravel → WEST END SAND & GRAVEL; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Linda E  Myers → WEST END SAND & GRAVEL; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda E  Myers → West End Sand & Gravel; 1998-10-01 to current/open; source msha-controller-operator-history