# Relationship history for MSHA mine 4002604

Current hierarchy: **Wolf Joseph W → C & W Coal Company Inc → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** C & W Coal Company Inc → No 1 Surface; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wolf Joseph W → No 1 Surface; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wolf Joseph W → C & W Coal Company Inc; 1980-01-01 to current/open; source msha-controller-operator-history