# Relationship history for MSHA mine 4105137

Current hierarchy: **Nancy  Finley → J&W Services → De Leon Sand Plant**

- 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

- **operator_operates_mine:** J&W Services → De Leon Sand Plant; 2015-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nancy  Finley et al → De Leon Sand Plant; 2015-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  Finley et al → J&W Services; 2015-07-14 to current/open; source msha-controller-operator-history