# Relationship history for MSHA mine 0801326

Current hierarchy: **Christopher L  Gehring → Earth Tech Enterprises Inc → Aggrisource**

- 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:** Earth Tech Enterprises Inc → Aggrisource; 2003-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher L  Gehring → Aggrisource; 2003-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher L  Gehring → Earth Tech Enterprises Inc; 2003-10-16 to current/open; source msha-controller-operator-history