# Relationship history for MSHA mine 0900114

Current hierarchy: **Oil Dri Corporation Of America → Oil-Dri Georgia LLC → Simpson**

- 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:** Oil-Dri Georgia LLC → Simpson; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oil Dri Corporation Of America → Simpson; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oil Dri Corporation Of America → Oil-Dri Georgia LLC; 1950-01-01 to current/open; source msha-controller-operator-history