# Relationship history for MSHA mine 1517140

Current hierarchy: **Brown Carl J → Wolf Creek Coal Company → Sullivan Processing Plant**

- 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:** Brown Carl J → Sullivan Processing Plant; 1990-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Creek Coal Company → Sullivan Processing Plant; 1991-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Carl J → Wolf Creek Coal Company; 1991-09-01 to current/open; source msha-controller-operator-history