# Relationship history for MSHA mine 3901423

Current hierarchy: **Trevor J  Lien; Jason  Lien → Lien Transportation Company → Port #2 Chieftain Screen #918**

- 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:** Trevor J  Lien et al → Port #2 Chieftain Screen #918; 1985-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lien Transportation Company → Port #2 Chieftain Screen #918; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trevor J  Lien et al → Lien Transportation Company; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Lien et al → Lien Transportation Company; 1998-06-01 to current/open; source msha-controller-operator-history