# Relationship history for MSHA mine 2402281

Current hierarchy: **Walter J  Woodland → W. J. Woodland & Associates, Inc. → Woodland, EXTIC Portable**

- 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:** W. J. Woodland & Associates, Inc. → Woodland, EXTIC Portable; 2002-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walter J  Woodland → Woodland, EXTIC Portable; 2002-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter J  Woodland → W. J. Woodland & Associates, Inc.; 2002-05-02 to current/open; source msha-controller-operator-history