# Relationship history for MSHA mine 2700511

Current hierarchy: **Todd M  Bahan → Groundhog Landscaping & Property Maintenance, Inc → Big Green**

- 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

- **operator_operates_mine:** Groundhog Landscaping & Property Maintenance, Inc → Big Green; 2019-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Todd M  Bahan → Big Green; 2019-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd M  Bahan → Groundhog Landscaping & Property Maintenance, Inc; 2019-10-02 to current/open; source msha-controller-operator-history