# Relationship history for MSHA mine 2002360

Current hierarchy: **West E R → Nashville Gravel Company → Huntington Dredge & Mill**

- 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

- **operator_operates_mine:** Nashville Gravel Company → Huntington Dredge & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** West E R → Huntington Dredge & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** West E R → Nashville Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history