# Relationship history for MSHA mine 4608643

Current hierarchy: **Joseph D  Juszczak → Juszczak Development Inc → RIVERROCK SAN & GRAVEL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Juszczak Development Inc → RIVERROCK SAN & GRAVEL; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph D  Juszczak → RIVERROCK SAN & GRAVEL; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph D  Juszczak → Juszczak Development Inc; 1997-05-01 to current/open; source msha-controller-operator-history