Request for a preliminary ruling from the Bundesfinanzgericht in the case Nigl and Others. Do three associations of persons constitute three independent traders (taxable persons) where those associations consist of different members of one family, conduct themselves outwardly as such independently in relation to their suppliers and to public authorities, possess their own production facilities, with the exception of two business assets, but market under a common trade mark the greater part of their products through a limited company whose shares are held by the members of the associations of persons and other members of the family?
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