# Relationship history for MSHA mine 0405982

Current hierarchy: **Ken  Wahlund → Wahlund Construction, Inc. → Wahlund Construction, Inc.**

- 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

- **operator_operates_mine:** GLJ Construction → Wahlund Construction, Inc.; 2025-02-12 to 2025-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Johnston → Wahlund Construction, Inc.; 2025-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Johnston → GLJ Construction; 2025-02-12 to 2025-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Wahlund Construction, Inc. → Wahlund Construction, Inc.; 2025-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ken  Wahlund → Wahlund Construction, Inc.; 2025-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Wahlund → Wahlund Construction, Inc.; 2025-12-01 to current/open; source msha-controller-operator-history