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Are the major, minor number unique

Are the major, minor number Unique?

Do we have any citations and reference to it?

NAME   MAJ:MIN RM   SIZE RO MOUNTPOINT
sda      8:0    0 465.8G  0 
├─sda1   8:1    0 298.2M  0 
├─sda2   8:2    0     3G  0 
├─sda3   8:3    0 458.7G  0 /
├─sda4   8:4    0     1K  0 
└─sda5   8:5    0   3.8G  0 
sr0     11:0    1  1024M  0