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FDA注冊分企業注冊和產品注冊，產品注冊好了會立刻下發產品注冊號，即Device Number，但是企業注冊好了FDA只會先下發Owner Number，企業注冊號（Registration Number）需要等待至少90天以上，FDA系統才會自動下發，當然了這個企業注冊號不會影響任何出口。詳細見如下FDA官方正式回復：
It may take up to 90 days or more for your registration number to be assigned.
Your registration information has been forwarded to the Division of Field Investigations (for foreign establishments) or to the District Office in your area (for domestic establishments) for assignment of your registration number. They are currently working on assigning these numbers. Once your registration number is assigned, we will send an email to the official correspondent and owner/operator informing them of the registration number. You can also check to see if your registration number has been assigned by logging into your FURLS account and selecting “View Your Registration and Listing Information” from the Device Registration and Listing Main Menu.
Until the registration number is received, you may conduct business using your owner/operator and listing numbers.