# Relationship history for MSHA mine 4202170

Current hierarchy: **Johnson Gary P → D G Johnson Trucking Inc → D.J. JOHNSON TRUCKING 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:** D G Johnson Trucking Inc → D.J. JOHNSON TRUCKING PORTABLE; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Gary P → D.J. JOHNSON TRUCKING PORTABLE; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Gary P → D G Johnson Trucking Inc; 1997-04-01 to current/open; source msha-controller-operator-history