# Relationship history for MSHA mine 3003580

Current hierarchy: **Ada  Zehnick; Joseph  Zehnick → Joe's NYS Bluestone → Joe's NYS Bluestone**

- 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:** Joe's NYS Bluestone → Joe's NYS Bluestone; 2007-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ada  Zehnick et al → Joe's NYS Bluestone; 2007-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ada  Zehnick et al → Joe's NYS Bluestone; 2007-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Zehnick et al → Joe's NYS Bluestone; 2007-04-11 to current/open; source msha-controller-operator-history