# Relationship history for MSHA mine 4300580

Current hierarchy: **Scott  Gross → John Gross Trucking → Kolberg**

- 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:** John Gross Trucking → Kolberg; 2002-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Gross → Kolberg; 2002-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Gross → John Gross Trucking; 2002-08-01 to current/open; source msha-controller-operator-history