what do the letter/numbers in the white box beside Made In China mean ? B00?

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Main image of NEW NMB-MAT 4715PS-20T-B30 200V 14/13W 12038 aluminum frame suitable for 220V industrial case cooling fan

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NEW NMB-MAT 4715PS-20T-B30 200V 14/13W 12038 aluminum frame suitable for 220V industrial case cooling fan

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2 Ball

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Brand: NMB
Model: 4715PS-20T-B30
Size: 120x120x38mm
Voltage: AC200V
Wind: 102CFM
Power: 13 / 14W
Number of revolutions: 2900RPM
Origin: Minebea China base
Bearings: precision ball bearings

Details
Type	Case Fan
Bearing Type	2 Ball
Color	Black
LED	Non-LED

Additional Information
First Listed on Newegg	September 29, 2016

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Item#: 9SIAAES4W87093