# Relationship history for MSHA mine 3609847

Current hierarchy: **Anthony Q  Yost → T & J Coal → T & J Coal 2**

- 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:** Anthony Q  Yost → T & J Coal 2; 2009-01-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & J Coal → T & J Coal 2; 2010-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony Q  Yost → T & J Coal; 2010-04-19 to current/open; source msha-controller-operator-history