# Relationship history for MSHA mine 3004150

Current hierarchy: **J R  Pratt → PRATT TRUCKING & EXCAVATING LLC → POWERSCREEN 1800**

- 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:** J R  Pratt → POWERSCREEN 1800; 2024-07-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** PRATT TRUCKING & EXCAVATING LLC → POWERSCREEN 1800; 2025-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J R  Pratt → PRATT TRUCKING & EXCAVATING LLC; 2025-03-31 to current/open; source msha-controller-operator-history