# Relationship history for MSHA mine 3102388

Current hierarchy: **Thomas E Stevenson → Stevenson Sand Inc → Stevenson Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-28T11:51:57.825640+00:00

## Valid-time edges

Historical edge projection is not bundled for this mine yet.