# Relationship history for MSHA mine 3800547

Current hierarchy: **Ashland Inc → Apac-Carolina Inc → Plant 0406 Mine 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:** Ashland Inc → Plant 0406 Mine Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smith Grading & Paving Inc → Plant 0406 Mine Pit; 1979-01-01 to 1988-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Smith C D Jr → Plant 0406 Mine Pit; 1979-01-01 to 1988-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Smith C D Jr → Smith Grading & Paving Inc; 1979-01-01 to 1988-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Apac-Carolina Inc → Plant 0406 Mine Pit; 1988-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac-Carolina Inc; 1988-01-25 to current/open; source msha-controller-operator-history