# Relationship history for MSHA mine 4503694

Current hierarchy: **John  Konzal → Integrity Excavation, Inc. → Integrity Rock Products**

- 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:** Integrity Excavation, Inc. → Integrity Rock Products; 2011-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Konzal et al → Integrity Rock Products; 2011-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Konzal et al → Integrity Excavation, Inc.; 2011-08-17 to current/open; source msha-controller-operator-history