'why is there more than one entry for the same company in oui.txt?

I'm working with the oui.txt file that contains data about mac prefix address for every company but i noticed that it exists more than one entry for some companies but with a diferent mac prefix for the same company. for example(lets say apple): enter image description here

so does anyone know why there are more than one ? does it means that each entry represents a different kind of device? thanks.



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