# Relationship history for MSHA mine 2402283

Current hierarchy: **Albert A  Schellinger → Schellinger Construction Co. Inc. → Sullivan Wash Plant**

- 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:** Albert A  Schellinger → Sullivan Wash Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schellinger Sand & Gravel → Sullivan Wash Plant; 2002-05-06 to 2004-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Albert A  Schellinger → Sullivan Wash Plant; 2002-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert A  Schellinger → Schellinger Sand & Gravel; 2002-05-06 to 2004-03-23; source msha-controller-operator-history
- **operator_operates_mine:** Schellinger Construction Co. Inc. → Sullivan Wash Plant; 2004-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert A  Schellinger → Schellinger Construction Co. Inc.; 2004-03-24 to current/open; source msha-controller-operator-history