# Relationship history for MSHA mine 3609289

Current hierarchy: **Larry G  Kebert → Meadville Redi-Mix Concrete → Eagle Crusher 500 Portable**

- 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

- **controller_controls_mine:** Larry G  Kebert → Eagle Crusher 500 Portable; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meadville Redi-Mix Concrete → Eagle Crusher 500 Portable; 2004-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry G  Kebert → Meadville Redi-Mix Concrete; 2004-11-09 to current/open; source msha-controller-operator-history