# Relationship history for MSHA mine 3200821

Current hierarchy: **Troy  Hentz → VTS Rocks Inc. → Mobile 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Troy  Hentz → Mobile Plant; 2005-05-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** VTS Rocks Inc. → Mobile Plant; 2005-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy  Hentz → VTS Rocks Inc.; 2005-06-20 to current/open; source msha-controller-operator-history