# Relationship history for MSHA mine 4503792

Current hierarchy: **Brian J Winkler; Ann M Winkler → Pro-Recycle LLC → Portable 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:** Pro-Recycle LLC → Portable Plant; 2019-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian J Winkler et al → Portable Plant; 2019-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian J Winkler et al → Pro-Recycle LLC; 2019-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ann M Winkler et al → Pro-Recycle LLC; 2019-03-28 to current/open; source msha-controller-operator-history