# Relationship history for MSHA mine 0405792

Current hierarchy: **Deawn  Weiher; Todd  Weiher → Advanced Rock Crushing Service LLC → Plant #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Advanced Rock Crushing Service LLC → Plant #1; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deawn  Weiher et al → Plant #1; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deawn  Weiher et al → Advanced Rock Crushing Service LLC; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Weiher et al → Advanced Rock Crushing Service LLC; 2009-08-31 to current/open; source msha-controller-operator-history