# Relationship history for MSHA mine 4202097

Current hierarchy: **Richard E  Morgan Sr; Richard E  Morgan Jr → Eugene Morgan & Son Excavating → Eugene Morgan & Son Portable**

- 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:** Eugene Morgan & Son Excavating → Eugene Morgan & Son Portable; 1994-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Morgan Sr  et al → Eugene Morgan & Son Portable; 1994-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Morgan Sr  et al → Eugene Morgan & Son Excavating; 1994-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Morgan Jr  et al → Eugene Morgan & Son Excavating; 1994-01-01 to current/open; source msha-controller-operator-history