# Relationship history for MSHA mine 2402297

Current hierarchy: **Albert A  Schellinger → Schellinger Sand & Gravel, Inc. → Twin Creeks**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Albert A  Schellinger → Twin Creeks; 2002-05-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schellinger Sand & Gravel, Inc. → Twin Creeks; 2002-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert A  Schellinger → Schellinger Sand & Gravel, Inc.; 2002-08-15 to current/open; source msha-controller-operator-history