I am going to respond in two different ways.....
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If the manufacturing site is sooooo important that you feel compelled to link to it 10,000 times then maybe you should only have one website?
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If I owned two websites on the same topic I would seriously consider combining them for SEO reasons. That gives you a single site with all of the strengths of the two sites together.
Clans unite when facing a foe instead of dividing themselves to be conquered.