# Relationship history for MSHA mine 3003221

Current hierarchy: **John F  Gizzi → West Hook Sand & Gravel Inc. → West Hook Sand & Gravel, Inc.**

- 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

- **operator_operates_mine:** West Hook Sand & Gravel Inc. → West Hook Sand & Gravel, Inc.; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John F  Gizzi et al → West Hook Sand & Gravel, Inc.; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Gizzi et al → West Hook Sand & Gravel Inc.; 1998-05-01 to current/open; source msha-controller-operator-history