# Relationship history for MSHA mine 2200035

Current hierarchy: **Oil Dri Corporation Of America → Oil Dri Production Company LLC → Ripley Mine and Mill**

- 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 Dri Production Company LLC → Ripley Mine and Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oil Dri Corporation Of America → Ripley Mine and Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oil Dri Corporation Of America → Oil Dri Production Company LLC; 1950-01-01 to current/open; source msha-controller-operator-history