# Relationship history for MSHA mine 3003487

Current hierarchy: **George W Sanford → Sanford Stone LLC → Cascade Valley**

- 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:** Lon  A  Thomas → Cascade Valley; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Star Stone Quarries Inc → Cascade Valley; 2005-03-30 to 2017-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Lon  A  Thomas → Star Stone Quarries Inc; 2005-03-30 to 2017-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Sanford Stone LLC → Cascade Valley; 2017-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George W Sanford → Cascade Valley; 2017-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George W Sanford → Sanford Stone LLC; 2017-11-07 to current/open; source msha-controller-operator-history