# Relationship history for MSHA mine 3201059

Current hierarchy: **Rebecca  Hill → Sundre Sand & Gravel → TeeRex**

- 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 → TeeRex; 1998-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sundre Sand & Gravel → TeeRex; 2015-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rebecca  Hill → Sundre Sand & Gravel; 2015-09-16 to current/open; source msha-controller-operator-history