The module Products Manufacturers adds the ability to attach a manufacturer to products, it is a Many2One relation so, A manufacturer can have many related products. BUT, for electronic components (and other products) you can sometime have many manufacturers for the same components.
Is there somewhere out there a mod to enable you to add more then 1 manufacturer to the same product ?
Related topic: http://help.openerp.com/question/4366/can-i-enter-multiple-manufacturers/