# Relationship history for MSHA mine 2103464

Current hierarchy: **Judith A  Havel → Havel Gravel, Inc. → Screen Plant #1**

- 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:** Havel Gravel, Inc. → Screen Plant #1; 2004-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Judith A  Havel et al → Screen Plant #1; 2004-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Judith A  Havel et al → Havel Gravel, Inc.; 2004-08-10 to current/open; source msha-controller-operator-history