# Relationship history for MSHA mine 3609499

Current hierarchy: ** → ROXCOAL INC. → NORTH BRANCH ROCK REFUSE DISPOSAL AREA**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

Historical edge projection is not bundled for this mine yet.