They are made in multiplying numbers (8)

I believe the answer is:

products

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'numbers' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps you can see a link between them that I can't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for products that I've seen before include "Commodities, merchandise" , "Goods" , "Commodities offered for sale" .)

I've seen this clue in The Irish Independent.

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