# Relationship history for MSHA mine 4202775

Current hierarchy: **E Paul  Sonderegger → Sonderegger Inc → Portable Plant 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:** Sonderegger Inc → Portable Plant 1; 2025-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** E Paul  Sonderegger → Portable Plant 1; 2025-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E Paul  Sonderegger → Sonderegger Inc; 2025-02-04 to current/open; source msha-controller-operator-history