# Relationship history for MSHA mine 0405991

Current hierarchy: **Milan  Lubanko → L & G Portable Crushing and Materials → Poway Aggregates**

- 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:** L & G Portable Crushing and Materials → Poway Aggregates; 2026-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Milan  Lubanko → Poway Aggregates; 2026-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milan  Lubanko → L & G Portable Crushing and Materials; 2026-08-27 to current/open; source msha-controller-operator-history