Floor covering sorts of slug-making machines (9)

I believe the answer is:

linotypes

I'm a little stuck... Click here to teach me more about this clue!

'machines' is the definition.
(linotype is a kind of machine)

'floor covering sorts' is the wordplay.
'floor covering' becomes 'lino' (short for linoleum).
'sorts' becomes 'types' (type is a kind of sort).
'lino'+'types'='LINOTYPES'

'of slug-making' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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