# Relationship history for MSHA mine 2200610

Current hierarchy: **Gates W A Jr → Magnolia Sand & Gravel → Plant B**

- 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:** Gates W A Jr → Plant B; 1988-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magnolia Sand & Gravel → Plant B; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gates W A Jr → Magnolia Sand & Gravel; 1989-03-01 to current/open; source msha-controller-operator-history