# Relationship history for MSHA mine 2103852

Current hierarchy: **Tracy A Hazelton → H & S Contracting, Inc. → HHE 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:** Tracy A Hazelton → HHE Wash Plant; 2014-12-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & S Contracting, Inc. → HHE Wash Plant; 2015-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy A Hazelton → H & S Contracting, Inc.; 2015-04-02 to current/open; source msha-controller-operator-history