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(1) At the end of Sub-section (2) of Section forty-one of the principal Act, the following proviso shall be added:—
Provided that the protection afforded by this Sub-section shall not extend to a patentee
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who has commercially worked his invention in the United Kingdom for more than six months prior to such publication as aforesaid.
(2) This Section shall not apply in the case of patents granted before the passing of this Act.