# Relationship history for MSHA mine 2002994

Current hierarchy: **Edward C  Levy Jr → Ray Road Sand & Gravel → RAY ROAD SAND & GRAVEL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Ray Road Sand & Gravel → RAY ROAD SAND & GRAVEL; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward C  Levy Jr et al → RAY ROAD SAND & GRAVEL; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward C  Levy Jr et al → Ray Road Sand & Gravel; 1997-03-01 to current/open; source msha-controller-operator-history