# Relationship history for MSHA mine 4700745

Current hierarchy: **Cole W  Szpara → Slobodnik Gravel and Excavating, LLC → Slobodnik Gravel and Excavating, LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** L.R. Slobodnik → Slobodnik Gravel and Excavating, LLC; 1990-05-01 to 2014-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Laurence  Slobodnik → Slobodnik Gravel and Excavating, LLC; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laurence  Slobodnik → L.R. Slobodnik; 1990-05-01 to 2014-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Slobodnik Gravel and Excavating, LLC → Slobodnik Gravel and Excavating, LLC; 2014-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cole W  Szpara → Slobodnik Gravel and Excavating, LLC; 2014-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cole W  Szpara → Slobodnik Gravel and Excavating, LLC; 2014-06-03 to current/open; source msha-controller-operator-history