3.1. In this Part, “deed of incorporation” means, as the case may be, the memorandum of agreement, letters patent, supplementary letters patent, the by-laws made under sections 21 and 87 and the notices contemplated in section 32 or, where the provision applies to companies governed by Part IA, the articles of these companies, together with the certificate contemplated in paragraph 2 of section 123.15, the documents contemplated in section 123.14 and the notices contemplated in sections 123.37 and 123.81.