# Relationship history for MSHA mine 5400516

Current hierarchy: **Arnaldo J Burgos Hernandez → NORVAN GENERAL CONTRACTOR, INC. → NORVAN GENERAL CONTRACTOR, INC., CANTERA**

- 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:** NORVAN GENERAL CONTRACTOR, INC. → NORVAN GENERAL CONTRACTOR, INC., CANTERA; 2025-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arnaldo J Burgos Hernandez → NORVAN GENERAL CONTRACTOR, INC., CANTERA; 2025-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arnaldo J Burgos Hernandez → NORVAN GENERAL CONTRACTOR, INC.; 2025-09-30 to current/open; source msha-controller-operator-history