# Relationship history for MSHA mine 0504978

Current hierarchy: **Judy  DeVincentis → Western Gravel, Inc. → Screen Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Judy  DeVincentis et al → Screen Plant; 1994-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Gravel, Inc. → Screen Plant; 2011-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Judy  DeVincentis et al → Western Gravel, Inc.; 2011-03-23 to current/open; source msha-controller-operator-history