When Scotweb uses the abbreviation MARTO to designate a weaving mill, is this some subdivision of Lochcarron then?

Because on this page http://www.scotweb.co.uk/tartan/Isle...le%20of%20skye it would seem to suggest at least one other mill can weave it if MARTO is not the same company. Perhaps I just don't get the abbreviations.

Is this a rather unique situation where a given mill has exclusive weaving rights or is this a common practice?

Slàinte