# Relationship history for MSHA mine 2602326

Current hierarchy: **Efrain Rene  Morales Moreno → Nevada Quality Rock Inc → Nevada Quality Rock**

- 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:** Nevada Quality Rock Inc → Nevada Quality Rock; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sven O  Persson → Nevada Quality Rock; 1997-10-01 to 2004-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Sven O  Persson → Nevada Quality Rock Inc; 1997-10-01 to 2004-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Jan L  Lindqvist → Nevada Quality Rock; 2004-02-24 to 2021-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Jan L  Lindqvist → Nevada Quality Rock Inc; 2004-02-24 to 2021-11-29; source msha-controller-operator-history
- **controller_controls_mine:** James C Wulfenstein → Nevada Quality Rock; 2021-11-30 to 2026-06-01; source msha-controller-operator-history
- **controller_controls_operator:** James C Wulfenstein → Nevada Quality Rock Inc; 2021-11-30 to 2026-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Efrain Rene  Morales Moreno → Nevada Quality Rock; 2026-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Efrain Rene  Morales Moreno → Nevada Quality Rock Inc; 2026-06-02 to current/open; source msha-controller-operator-history