# Relationship history for MSHA mine 2501241

Current hierarchy: **Brad Louis  Vontz → Vontz Paving Inc. → Dredge 1**

- 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:** Brad Louis  Vontz → Dredge 1; 2005-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vontz Paving Inc. → Dredge 1; 2008-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad Louis  Vontz → Vontz Paving Inc.; 2008-04-03 to current/open; source msha-controller-operator-history