# Relationship history for MSHA mine 3401664

Current hierarchy: **Woodward County-Ok → Woodward County → DISTRICT #1**

- 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:** Woodward County-Ok → DISTRICT #1; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Woodward County → DISTRICT #1; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Woodward County-Ok → Woodward County; 1989-01-01 to current/open; source msha-controller-operator-history