# Relationship history for MSHA mine 4002660

Current hierarchy: **Aytes Gene → Aytes Coal Company Inc → Ajtco Inc / Prep 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

- **operator_operates_mine:** Aytes Coal Company Inc → Ajtco Inc / Prep Plant; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aytes Gene Et Al → Ajtco Inc / Prep Plant; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aytes Gene Et Al → Aytes Coal Company Inc; 1980-12-01 to current/open; source msha-controller-operator-history