# Relationship history for MSHA mine 4104344

Current hierarchy: **Lana J Zahn → Ronnie Zahn Paving, Inc. → Portable #2**

- 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:** Lana J Zahn → Portable #2; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ronnie Zahn Paving, Inc. → Portable #2; 2002-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lana J Zahn → Ronnie Zahn Paving, Inc.; 2002-02-28 to current/open; source msha-controller-operator-history