# Relationship history for MSHA mine 4703783

Current hierarchy: **Sandra  Babl → TITO, INC. → PORTABLE SCREENER 1**

- 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:** Tito Incorporated → PORTABLE SCREENER 1; 2016-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sandra  Babl → PORTABLE SCREENER 1; 2016-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra  Babl → Tito Incorporated; 2016-07-19 to current/open; source msha-controller-operator-history