# Relationship history for MSHA mine 2104074

Current hierarchy: **Mike D Hough → Hough Inc → 35E Kolberg Wash 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Mike D Hough → 35E Kolberg Wash Plant; 2004-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hough Inc → 35E Kolberg Wash Plant; 2024-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike D Hough → Hough Inc; 2024-06-04 to current/open; source msha-controller-operator-history