# Relationship history for MSHA mine 4608199

Current hierarchy: **Hoosier Don → D A & H Coal Company Inc → No 1a**

- 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:** Hoosier Don → No 1a; 1990-12-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D A & H Coal Company Inc → No 1a; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoosier Don → D A & H Coal Company Inc; 1992-07-01 to current/open; source msha-controller-operator-history