# Relationship history for MSHA mine 4603513

Current hierarchy: **Winkelman Dwight W → D W Winkelman Company → Dww Surface Mine No 2**

- 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

- **operator_operates_mine:** Neese Coal Corp → Dww Surface Mine No 2; 1950-01-01 to 1974-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Walter R  Neese et  al → Dww Surface Mine No 2; 1950-01-01 to 1975-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Walter R  Neese et  al → Neese Coal Corp; 1950-01-01 to 1974-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Winkelman Dwight W → Dww Surface Mine No 2; 1974-06-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D W Winkelman Company → Dww Surface Mine No 2; 1974-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Winkelman Dwight W → D W Winkelman Company; 1974-07-22 to current/open; source msha-controller-operator-history