This is a good site.
If you look at the symbol for the
manufacturer, usually it's a stylized letter. For example, National
Semiconductor is a funky looking N, Motorola a M that looks like the
Batman symbol, etc. International Rectifier has a capital IR surrounding
the schematic symbol of a diode in a circle. That sort of thing. This
site has a logo finder, and an explanation of the numbering system.
http://www.chipdocs.com/manufacturers/list.html
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