# Relationship history for MSHA mine 4406425

Current hierarchy: **Noah B  Lambert → Tara Coal Company Inc → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** A M A Coal Company Inc → No 1 Mine; 1987-11-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Mullins White Jr → No 1 Mine; 1987-11-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Mullins White Jr → A M A Coal Company Inc; 1987-11-01 to 1988-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Tara Coal Company Inc → No 1 Mine; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Noah B  Lambert → No 1 Mine; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Noah B  Lambert → Tara Coal Company Inc; 1988-06-14 to current/open; source msha-controller-operator-history