# Relationship history for MSHA mine 4105544

Current hierarchy: **Stefan  Angrisani → Diamondback Machinery, Inc/Diamondback Materials → Plum Grove**

- 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

- **operator_operates_mine:** Diamondback Machinery, Inc/Diamondback Materials → Plum Grove; 2021-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stefan  Angrisani → Plum Grove; 2021-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stefan  Angrisani → Diamondback Machinery, Inc/Diamondback Materials; 2021-01-16 to current/open; source msha-controller-operator-history