# Relationship history for MSHA mine 3901624

Current hierarchy: **Brad  Karlen; Warren  Karlen → Karlen Ranch → Karlen Pit**

- 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:** Karlen Ranch → Karlen Pit; 2017-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Karlen et al → Karlen Pit; 2017-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Karlen et al → Karlen Ranch; 2017-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren  Karlen et al → Karlen Ranch; 2017-03-02 to current/open; source msha-controller-operator-history