# Relationship history for MSHA mine 3606399

Current hierarchy: **Barrett Russell L Jr → Mill Run Contracting Inc → Mill Run Strip**

- 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:** Mill Run Contracting Inc → Mill Run Strip; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barrett Russell L Jr → Mill Run Strip; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrett Russell L Jr → Mill Run Contracting Inc; 1977-04-01 to current/open; source msha-controller-operator-history