# Relationship history for MSHA mine 0102166

Current hierarchy: **Crawford William Dale → Crawford Coal Company Inc → Mine No 3**

- 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:** Crawford William Dale → Mine No 3; 1976-02-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crawford Coal Company Inc → Mine No 3; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crawford William Dale → Crawford Coal Company Inc; 1979-12-01 to current/open; source msha-controller-operator-history