# Relationship history for MSHA mine 1512253

Current hierarchy: **Tackett Rodney → B R T Collieries 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Little Maurice → No 1 Mine; 1979-11-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Red Dog Coal Company Inc → No 1 Mine; 1980-03-01 to 1980-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Little Maurice → Red Dog Coal Company Inc; 1980-03-01 to 1980-09-25; source msha-controller-operator-history
- **operator_operates_mine:** B R T Collieries Inc → No 1 Mine; 1980-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Rodney → No 1 Mine; 1980-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Rodney → B R T Collieries Inc; 1980-09-26 to current/open; source msha-controller-operator-history