# Relationship history for MSHA mine 0405689

Current hierarchy: **Russell  Ricks → West Valley Sand & Gravel → West Valley 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 Valley Sand & Gravel → West Valley Sand & Gravel; 2006-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Russell  Ricks → West Valley Sand & Gravel; 2006-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell  Ricks → West Valley Sand & Gravel; 2006-07-03 to current/open; source msha-controller-operator-history