# Relationship history for MSHA mine 0405895

Current hierarchy: **David E  Crye → David Crye General Engineering Contractor → Warrior 1800/Cone Crusher FT200**

- 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:** David E  Crye → Warrior 1800/Cone Crusher FT200; 2015-03-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** David Crye General Engineering Contractor → Warrior 1800/Cone Crusher FT200; 2015-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Crye → David Crye General Engineering Contractor; 2015-03-12 to current/open; source msha-controller-operator-history