# Relationship history for MSHA mine 1519183

Current hierarchy: **Horace Garrison  Hill → D & C Mining Corporation → Mill Creek Surface**

- 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

- **controller_controls_mine:** Horace Garrison  Hill → Mill Creek Surface; 1995-05-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & C Mining Corporation → Mill Creek Surface; 2008-02-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horace Garrison  Hill → D & C Mining Corporation; 2008-02-07 to current/open; source msha-controller-operator-history