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Guidelines for Examination

 
 
3.2
Inclusion of additional features 

A claim may be limited by inclusion of additional features, provided the resulting combination was originally disclosed and does not relate to an invention which was not searched, for example:

(a)
from dependent claims, which were dependent on the claim to be limited 
(b)
from the description e.g. the examples 
(c)
from drawings (see H-V, 6)
(d)
arising from the conversion of an independent claim to a dependent claim.