# Relationship history for MSHA mine 2902389

Current hierarchy: **George  Mulvaney; Ron  Standiferd → Ponderosa Aggregate LLC → Miller Property**

- 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:** Ponderosa Aggregate LLC → Miller Property; 2009-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George  Mulvaney et al → Miller Property; 2009-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Mulvaney et al → Ponderosa Aggregate LLC; 2009-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Standiferd et al → Ponderosa Aggregate LLC; 2009-06-08 to current/open; source msha-controller-operator-history