Where can I find my Brother machine's serial number?

Where can I find my Brother machine

Where can I find my Brother printer's serial number?

Where can I find my Brother machine's serial number?

MFC-L8900CDW Where can I find my Brother machine's serial number?

Where can I find my Brother machine's serial number?

Where can I find my Brother machine's serial number?

Where can I find my Brother printer's serial number?

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Where can I find my Brother machine's serial number?

Where can I find my Brother machine's serial number?