# Relationship history for MSHA mine 4202555

Current hierarchy: **Shane  Campbell → Scamp Excavation, Inc → Wellington Portable**

- 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:** Scamp Excavation, Inc → Wellington Portable; 2010-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shane  Campbell → Wellington Portable; 2010-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane  Campbell → Scamp Excavation, Inc; 2010-08-10 to current/open; source msha-controller-operator-history