# Relationship history for MSHA mine 4606331

Current hierarchy: **Ruth  Prater → Coal Sales International Ltd → Loading Dock No 1**

- 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

- **controller_controls_mine:** Ruth  Prater  et al → Loading Dock No 1; 1980-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Sales International Ltd → Loading Dock No 1; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruth  Prater  et al → Coal Sales International Ltd; 1981-05-01 to current/open; source msha-controller-operator-history