# Relationship history for MSHA mine 2103430

Current hierarchy: **Borders Sand & Gravel → E & D Construction, Inc. → Plant 55**

- 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

- **operator_operates_mine:** E & D Construction, Inc. → Plant 55; 2004-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Borders Sand & Gravel → Plant 55; 2004-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Borders Sand & Gravel → E & D Construction, Inc.; 2004-05-25 to current/open; source msha-controller-operator-history