# Relationship history for MSHA mine 4405030

Current hierarchy: **Adkins Sherman & Estil → A & A Coal Company Inc → No 4 Mine**

- 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:** Adkins Sherman & Estil → No 4 Mine; 1976-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & A Coal Company Inc → No 4 Mine; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Sherman & Estil → A & A Coal Company Inc; 1978-04-01 to current/open; source msha-controller-operator-history