Where a group of inventions is claimed
in one and the same international application,
the requirement of unity of invention referred
to in Rule 13.1 shall be
fulfilled only when there is a technical
relationship among those inventions involving
one or more of the same or corresponding
special technical features. The expression
"special technical features" shall mean those
technical features that define a contribution
which each of the claimed inventions,
considered as a whole, makes over the prior
art.
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