# Relationship history for MSHA mine 3200867

Current hierarchy: **Allyn E  Axvig → Great Plains Excavating Co Inc → #2**

- 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

- **controller_controls_mine:** Allyn E  Axvig → #2; 2007-05-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Great Plains Excavating Co Inc → #2; 2010-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allyn E  Axvig → Great Plains Excavating Co Inc; 2010-08-31 to current/open; source msha-controller-operator-history