# Relationship history for MSHA mine 2200791

Current hierarchy: **William G  Yates Jr → Baldwin Sand and Gravel → Cotton Fields**

- 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:** William G  Yates Jr et al → Cotton Fields; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baldwin Sand and Gravel → Cotton Fields; 2009-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William G  Yates Jr et al → Baldwin Sand and Gravel; 2009-01-01 to current/open; source msha-controller-operator-history