# Relationship history for MSHA mine 1504255

Current hierarchy: **James P  Jurgensen II; Jacqueline J  Alf; Jason R  Jurgensen → Northern Kentucky Aggregates Inc → PLANT #1**

- 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:** Northern Kentucky Aggregates Inc → PLANT #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James P  Jurgensen → PLANT #1; 1950-01-01 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_operator:** James P  Jurgensen → Northern Kentucky Aggregates Inc; 1950-01-01 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Jacqueline J  Alf et al → PLANT #1; 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacqueline J  Alf et al → Northern Kentucky Aggregates Inc; 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Jurgensen II et al → Northern Kentucky Aggregates Inc; 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason R  Jurgensen et al → Northern Kentucky Aggregates Inc; 2018-11-01 to current/open; source msha-controller-operator-history