29. Associated trade marks shall be assignable or transmissible only as a whole and not separately, but they shall for all other purposes be deemed to have been registered as separate trade marks:
Provided that —
(a)
where under the provisions of this Act user of a registered trade mark is required to be proved for any purpose, the court or the Registrar may, if and so far as it or he thinks right, accept user of an associated registered trade mark, or of the trade mark with additions and alterations not substantially affecting its identity, as an equivalent for such user; and
(b)
the foregoing provisions apply in relation to proof of use of any registered trade mark and not in relation only to proof of use of a trade mark which is one of two or more associated trade marks.