# Relationship history for MSHA mine 3200865

Current hierarchy: **Clay E  Erdman → Oil Patch Support → Backman Gravel Pit**

- 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:** Oil Patch Support → Backman Gravel Pit; 2010-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clay E  Erdman et al → Backman Gravel Pit; 2010-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clay E  Erdman et al → Oil Patch Support; 2010-10-15 to current/open; source msha-controller-operator-history