# Relationship history for MSHA mine 1601250

Current hierarchy: **Perkins Linda I → L I P Dirt & Trucking → L I P Dirt & Trucking**

- 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:** L I P Dirt & Trucking → L I P Dirt & Trucking; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Perkins Linda I → L I P Dirt & Trucking; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Perkins Linda I → L I P Dirt & Trucking; 1992-12-01 to current/open; source msha-controller-operator-history