# Relationship history for MSHA mine 1401495

Current hierarchy: **Stout Roger-George & Sam → S & S Bulldozer Service → Sunflower 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:** S & S Bulldozer Service → Sunflower Sand & Gravel; 1985-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stout Roger-George & Sam → Sunflower Sand & Gravel; 1985-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stout Roger-George & Sam → S & S Bulldozer Service; 1985-11-01 to current/open; source msha-controller-operator-history