# Relationship history for MSHA mine 4002540

Current hierarchy: **W T  Strunk → Strunk Brothers Coal Company → Strunk Brothers Co -Tipple**

- 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:** W T  Strunk et al → Strunk Brothers Co -Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Strunk Brothers Coal Company → Strunk Brothers Co -Tipple; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W T  Strunk et al → Strunk Brothers Coal Company; 1979-07-01 to current/open; source msha-controller-operator-history