# Relationship history for MSHA mine 3002580

Current hierarchy: **Paul H  Lyndaker → Lyndaker Excavating & Trucking Llc → Milton Lehman 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Penn-Dixie Industries Inc → Milton Lehman Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Callanan Industries Inc → Milton Lehman Pit; 1981-04-01 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Penn-Dixie Industries Inc → Callanan Industries Inc; 1981-04-01 to 1987-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Lyndaker Excavating & Trucking Llc → Milton Lehman Pit; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul H  Lyndaker → Milton Lehman Pit; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul H  Lyndaker → Lyndaker Excavating & Trucking Llc; 1987-10-01 to current/open; source msha-controller-operator-history