# Relationship history for MSHA mine 4606039

Current hierarchy: **Winkelman Dwight W → Craig Contractors Inc → No 5 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:** Winkelman Dwight W → No 5 Surface; 1974-07-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Craig Contractors Inc → No 5 Surface; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Winkelman Dwight W → Craig Contractors Inc; 1979-07-01 to current/open; source msha-controller-operator-history