# Relationship history for MSHA mine 2002964

Current hierarchy: **Great Lakes Aggregates LLC → Sylvania Minerals LLC → Sylvania Minerals**

- 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:** Sylvania Company Limited Partnership → Sylvania Minerals; 1995-12-01 to 2004-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Angelo E  Iafrate  et al → Sylvania Minerals; 1995-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Angelo E  Iafrate  et al → Sylvania Company Limited Partnership; 1995-12-01 to 2004-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Sylvania Minerals LLC → Sylvania Minerals; 2004-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Great Lakes Aggregates LLC → Sylvania Minerals; 2004-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Lakes Aggregates LLC → Sylvania Minerals LLC; 2004-01-22 to current/open; source msha-controller-operator-history