# Relationship history for MSHA mine 3003967

Current hierarchy: **Richard P Hannan; Dale  Twardokus → Victor Gravel Corp. → Victor Gravel Pit**

- 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:** Victor Gravel Corp. → Victor Gravel Pit; 2015-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dale  Twardokus et al → Victor Gravel Pit; 2015-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale  Twardokus et al → Victor Gravel Corp.; 2015-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard P Hannan et al → Victor Gravel Corp.; 2015-09-02 to current/open; source msha-controller-operator-history