# Relationship history for MSHA mine 2501273

Current hierarchy: **Brad Louis  Vontz → Vontz Paving, Inc → Dredge 3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Brad Louis  Vontz → Dredge 3; 2005-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vontz Paving, Inc → Dredge 3; 2011-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad Louis  Vontz → Vontz Paving, Inc; 2011-03-10 to current/open; source msha-controller-operator-history