# Relationship history for MSHA mine 3304540

Current hierarchy: **James P  Jurgensen II; Jacqueline J  Alf; Jason R  Jurgensen → Melvin Stone LLC → Melvin Stone-Mashall**

- 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:** James P  Jurgensen → Melvin Stone-Mashall; 1999-08-06 to 2018-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Marshall Quarry, Inc. → Melvin Stone-Mashall; 2005-02-25 to 2026-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Ronald L  Main → Melvin Stone-Mashall; 2005-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald L  Main → Marshall Quarry, Inc.; 2005-02-25 to 2026-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Jacqueline J  Alf et al → Melvin Stone-Mashall; 2018-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Melvin Stone LLC → Melvin Stone-Mashall; 2026-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacqueline J  Alf et al → Melvin Stone LLC; 2026-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason R  Jurgensen et al → Melvin Stone LLC; 2026-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Jurgensen II et al → Melvin Stone LLC; 2026-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Jurgensen → Melvin Stone LLC; 2026-07-16 to 2018-04-30; source msha-controller-operator-history