# Relationship history for MSHA mine 4503689

Current hierarchy: **David M  Konen → Koncrete Industries, Inc. → Koncrete Industries Screening Plant**

- 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:** Koncrete Industries, Inc. → Koncrete Industries Screening Plant; 2011-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M  Konen → Koncrete Industries Screening Plant; 2011-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Konen → Koncrete Industries, Inc.; 2011-04-05 to current/open; source msha-controller-operator-history