# Relationship history for MSHA mine 2003668

Current hierarchy: **Kent  Walton; David  Cutler; Nick  Walton; Bill  Cutler → Crystal Aggregate Materials, LLC → Portable 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:** Crystal Aggregate Materials, LLC → Portable Plant #1; 2024-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kent  Walton → Portable Plant #1; 2024-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent  Walton → Crystal Aggregate Materials, LLC; 2024-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Walton → Crystal Aggregate Materials, LLC; 2024-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Cutler → Crystal Aggregate Materials, LLC; 2024-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Cutler → Crystal Aggregate Materials, LLC; 2024-03-27 to current/open; source msha-controller-operator-history