# Relationship history for MSHA mine 4608333

Current hierarchy: **Wellman Travis S → Holly Mining Inc → Whitby Auger**

- 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:** Wellman Travis S → Whitby Auger; 1990-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holly Mining Inc → Whitby Auger; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wellman Travis S → Holly Mining Inc; 1993-09-01 to current/open; source msha-controller-operator-history