# Relationship history for MSHA mine 2700526

Current hierarchy: ** → S.U.R. Construction, Inc. → SUR Astec FT 200 Cone**

- 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

Historical edge projection is not bundled for this mine yet.