Section Text
(a) by the patentee or applicant for the patent or any person from whom he derives title; or (b) by any other person with the consent of the patentee or applicant for the patent or any person from whom he derives title, if the working was effected for the purpose of reasonable trial only and if it was reasonably necessary, having regard to the nature of the invention, that the working for that purpose should be effected in Section 33 - public