# Relationship history for MSHA mine 2402458

Current hierarchy: **Richard M  Sparrow → Montana Portable Crushing LLC → Screening 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

- **controller_controls_mine:** Richard M  Sparrow → Screening Plant #1; 2003-02-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montana Portable Crushing LLC → Screening Plant #1; 2006-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard M  Sparrow → Montana Portable Crushing LLC; 2006-07-06 to current/open; source msha-controller-operator-history