45 mm x 100 mm x 36 mm ISB 4309 ATN9 deep groove ball bearings

We work closely with our 45 mm x 100 mm x 36 mm ISB 4309 ATN9 deep groove ball bearings manufacturing partners to bring the NTN BEARING CORP.OF AMERICA best value For Outer Ring Application to customers. 45 mm x 100 mm x 36 mm

What is 4309 ATN9 bearing cross reference？