# Relationship history for MSHA mine 0405757

Current hierarchy: **Kevin L  Robertson; Craig D  Holt → Sierra Nevada Construction Inc. → Cain Ranch 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

- **controller_controls_mine:** Craig D  Holt et al → Cain Ranch Crusher; 2006-09-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Nevada Construction Inc. → Cain Ranch Crusher; 2008-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig D  Holt et al → Sierra Nevada Construction Inc.; 2008-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin L  Robertson et al → Sierra Nevada Construction Inc.; 2008-07-14 to current/open; source msha-controller-operator-history