# Relationship history for MSHA mine 4202656

Current hierarchy: **Dallas  Wardell → Wardell Brothers Construction → Wardell Brothers Construction-DH**

- 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:** Dallas  Wardell → Wardell Brothers Construction-DH; 2011-05-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wardell Brothers Construction → Wardell Brothers Construction-DH; 2016-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dallas  Wardell → Wardell Brothers Construction; 2016-01-26 to current/open; source msha-controller-operator-history