If the counterclaim is brought in a legal action to which the proprietor of the trade mark is not already a party, he shall be informed thereof and may be joined as a party to the action in accordance with the conditions set out in national law.
Má thugtar an frithéileamh i gcaingean dlí nach bhfuil dílseánach an trádmhairc ina pháirtí ann cheana féin, cuirfear air an eolas é faoin méid sin agus féadfaidh sé dul isteach mar pháirtí sa chaingean i gcomhréir leis na coinníollacha a leagtar amach faoin dlí náisiúnta.