# Relationship history for MSHA mine 5400334

Current hierarchy: **Colberg Janson (Nevares) → Colberg Nevares Enterprises Inc → Gravero Nevares**

- 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:** Colberg Nevares Enterprises Inc → Gravero Nevares; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colberg Janson (Nevares) → Gravero Nevares; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colberg Janson (Nevares) → Colberg Nevares Enterprises Inc; 1991-10-01 to current/open; source msha-controller-operator-history