73. CASE ACCOMPANYING APPLICATION. -Where a person applying under rule 71 for registration of his title, does not establish his claim under anv document or instrument which is capable in itself of furnishing proof of his title he shall, unless the Registrar otherwise directs, either upon or with the application, state a case setting forth the full particulars of the facts upon which his claim to be proprietor of the trade mark is based, and showing that the trade mark has been assigned or transmittal to him. If the Registrar so requires, the case shall be verified by an affidavit on Form TM- 18. |