# Relationship history for MSHA mine 1517540

Current hierarchy: **Edward  Tincher → Whymore Coal Company Inc → Hurricane Branch Job**

- 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

- **controller_controls_mine:** Edward  Tincher → Hurricane Branch Job; 1988-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Whymore Coal Company Inc → Hurricane Branch Job; 1994-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Tincher → Whymore Coal Company Inc; 1994-05-01 to current/open; source msha-controller-operator-history