Wenham Gas Co. Ltd. v.
copyright 1997 Donald M. Cameron, Aird & Berlis
At p. 56:
"... if the pith and marrow of the invention is taken it is no excuse to say that you have added something, or omitted something, even if the addition or omission be useful and valuable. The superadding of ingenuity to a robbery does not make the operation justifiable."
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