# Relationship history for MSHA mine 1517921

Current hierarchy: **Edward  Tincher → Sunrise Construction & Excavation Inc → Jacks Branch Rockholds Mtn #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Edward  Tincher → Jacks Branch Rockholds Mtn #2; 1997-01-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunrise Construction & Excavation Inc → Jacks Branch Rockholds Mtn #2; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Tincher → Sunrise Construction & Excavation Inc; 1997-04-01 to current/open; source msha-controller-operator-history