# Relationship history for MSHA mine 2200536

Current hierarchy: **Hudson Bobby M & William H → Hudson & Sons Sand & Gravel → Yocona Pit**

- 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

- **controller_controls_mine:** Hudson Bobby M & William H Et Al → Yocona Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hudson & Sons Sand & Gravel → Yocona Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hudson Bobby M & William H Et Al → Hudson & Sons Sand & Gravel; 1981-06-01 to current/open; source msha-controller-operator-history