# Relationship history for MSHA mine 3609769

Current hierarchy: **Tracy J  Crosby → Tracy Crosby → Tracy Crosby Mine #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:** Tracy J  Crosby → Tracy Crosby Mine #2; 2009-05-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tracy Crosby → Tracy Crosby Mine #2; 2009-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy J  Crosby → Tracy Crosby; 2009-06-16 to current/open; source msha-controller-operator-history