# Relationship history for MSHA mine 3901530

Current hierarchy: **Dina R  Shefner → Shefner Partnership → Screener**

- 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:** Shefner Partnership → Screener; 2008-07-28 to 2011-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Dina R  Shefner → Screener; 2008-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dina R  Shefner → Shefner Partnership; 2008-07-28 to 2011-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Shefner Partnership → Screener; 2011-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dina R  Shefner → Screener; 2011-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dina R  Shefner → Shefner Partnership; 2011-08-02 to current/open; source msha-controller-operator-history