# Relationship history for MSHA mine 3302487

Current hierarchy: **Carl L  Baker Jr → B & N Coal Inc → Marietta Dock**

- 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:** B & N Coal Inc → Marietta Dock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl L  Baker Jr → Marietta Dock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl L  Baker Jr → B & N Coal Inc; 1950-01-01 to current/open; source msha-controller-operator-history