# Relationship history for MSHA mine 1601251

Current hierarchy: **Leger Dallas → Big D Dirt Service Inc → Dorothy V 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Big D Dirt Service Inc → Dorothy V Pit; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leger Dallas → Dorothy V Pit; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leger Dallas → Big D Dirt Service Inc; 1992-12-01 to current/open; source msha-controller-operator-history