# Relationship history for MSHA mine 1201669

Current hierarchy: **Brown Eddie R & Mary K Brown → E & M Coal Inc → Oakhill 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** E & M Coal Inc → Oakhill Dock; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown Eddie R & Mary K Brown → Oakhill Dock; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Eddie R & Mary K Brown → E & M Coal Inc; 1978-09-01 to current/open; source msha-controller-operator-history