# Relationship history for MSHA mine 3003281

Current hierarchy: **Ricky  Vanguilder → One More Slate Company → ONE MORE SLATE CO.**

- 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:** Ricky  Vanguilder → ONE MORE SLATE CO.; 1997-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** One More Slate Company → ONE MORE SLATE CO.; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky  Vanguilder → One More Slate Company; 1999-06-01 to current/open; source msha-controller-operator-history