# Relationship history for MSHA mine 4801543

Current hierarchy: **Pete Lien & Sons Inc → Pete Lien & Sons, Inc./Sand & Gravel Division → Portable Wash Plant #3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Pete Lien & Sons Inc → Portable Wash Plant #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pete Lien & Sons, Inc./Sand & Gravel Division → Portable Wash Plant #3; 1997-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pete Lien & Sons Inc → Pete Lien & Sons, Inc./Sand & Gravel Division; 1997-07-01 to current/open; source msha-controller-operator-history