# Relationship history for MSHA mine 0405847

Current hierarchy: **Randall  Humphreys; Robert  Humphreys → Western States Wholesale → California Silica Products**

- 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:** Western States Wholesale → California Silica Products; 2012-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Humphreys et al → California Silica Products; 2012-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Humphreys et al → Western States Wholesale; 2012-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall  Humphreys et al → Western States Wholesale; 2012-05-23 to current/open; source msha-controller-operator-history