# Relationship history for MSHA mine 4703687

Current hierarchy: **Kevin P  Romitti → Midwest Gravel, Inc. → Portable 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:** Kevin P  Romitti → Portable Plant; 2009-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Gravel, Inc. → Portable Plant; 2013-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin P  Romitti → Midwest Gravel, Inc.; 2013-06-10 to current/open; source msha-controller-operator-history