# Relationship history for MSHA mine 0203123

Current hierarchy: **Beverly  Knox; Everett  Knox → KBO LLC → Arizona Crusher**

- 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:** KBO LLC → Arizona Crusher; 2006-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Everett  Knox et al → Arizona Crusher; 2006-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Everett  Knox et al → KBO LLC; 2006-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beverly  Knox et al → KBO LLC; 2006-04-01 to current/open; source msha-controller-operator-history