# Relationship history for MSHA mine 2103823

Current hierarchy: **Evan  Evenson → Evenson Gravel LLC → Portable 1**

- 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

- **operator_operates_mine:** Evenson Gravel LLC → Portable 1; 2014-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Evan  Evenson → Portable 1; 2014-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evan  Evenson → Evenson Gravel LLC; 2014-03-21 to current/open; source msha-controller-operator-history