# Relationship history for MSHA mine 4103638

Current hierarchy: **Nail C V → Nails Catfish Farm → NAILS DREDGE & PLANT**

- 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:** Nails Catfish Farm → NAILS DREDGE & PLANT; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nail C V → NAILS DREDGE & PLANT; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nail C V → Nails Catfish Farm; 1990-11-01 to current/open; source msha-controller-operator-history