# Relationship history for MSHA mine 3004137

Current hierarchy: **J R  Pratt → PRATT TRUCKING AND EXCAVATING → SANDVIC QH441**

- 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:** Pratt Trucking and Excavating → SANDVIC QH441; 2024-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J R  Pratt → SANDVIC QH441; 2024-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J R  Pratt → Pratt Trucking and Excavating; 2024-07-25 to current/open; source msha-controller-operator-history