# Relationship history for MSHA mine 3302203

Current hierarchy: **Crawford R Ronald & Raymond H → Crawford Coal Company → Crawford 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Crawford Coal Company → Crawford Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crawford R Ronald & Raymond H → Crawford Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crawford R Ronald & Raymond H → Crawford Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history