# Relationship history for MSHA mine 3502416

Current hierarchy: **Oil Dri Corporation Of America → Oil-Dri Production Co. → Christmas Valley Plant & 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

- **controller_controls_mine:** Oil Dri Corporation Of America → Christmas Valley Plant & Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Fossil Inc → Christmas Valley Plant & Pit; 1950-01-01 to 1979-05-18; source msha-controller-operator-history
- **controller_controls_mine:** American Fossil Inc → Christmas Valley Plant & Pit; 1950-01-01 to 1979-05-18; source msha-controller-operator-history
- **controller_controls_operator:** American Fossil Inc → American Fossil Inc; 1950-01-01 to 1979-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Oil-Dri Production Co. → Christmas Valley Plant & Pit; 1979-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oil Dri Corporation Of America → Oil-Dri Production Co.; 1979-05-19 to current/open; source msha-controller-operator-history