# Relationship history for MSHA mine 3201011

Current hierarchy: **Rebecca  Hill → Sundre Sand & Gravel Inc → Souris**

- 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

- **controller_controls_mine:** Rebecca  Hill → Souris; 1998-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sundre Sand & Gravel Inc → Souris; 2013-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rebecca  Hill → Sundre Sand & Gravel Inc; 2013-06-27 to current/open; source msha-controller-operator-history