counsel for the petitioner. In Smt. Shanti Devi L. Singh vs. Tax Recovery Officer and others, AIR 1991 Supreme Court 1880, it was held that since a certificate of sale itself is not a compulsorily registrable document in view of the provisions of Section 17(2)(xii) of the Registration Act, the transfer of title in favour of purchaser as revenue sale is not vitiated by non-registration of the certificate. The copy of the certificate thus filed in Book-I with the Sub Registrar contains all the relevant details and all that a Sub Registrar is required to do is to file a copy of the certificate in Book-I and no more. He does not have to copy out the certificate or make any other entries in BookI. However, whether any stamp duty or municipal transfer fee is payable in respect of original certificate of sale was a question left open. The Court while dealing with the plea that even if the certificate of registration is sought to be presented for registration the Sub Registrar has no jurisdiction to refuse registration on the ground that document is insufficiently stamped, observed that such a situation has not arisen as yet and it is unnecessary to anticipate it and decide the point. 11. In Municipal Corporation of Delhi vs. Pramod Kumar Gupta, AIR 1991 Supreme Court 401, it has been held that a title to the property put on auction sale passes under law when the sale is held. The owners and certain other interested persons are afforded opportunity under the Code to make a prayer for setting aside the sale on enumerated grounds and, after all such matters are disposed of without disturbing the sale, the sale is confirmed under Rule 92 of Order XXI of the said Code. The stage for issuing a certificate of sale arises only thereafter under Rule 94, Order XXI of the said Code. Thus, it was manifest that the title passes under the auction-sale by force of law and the transfer becomes final when an order under Rule 92 confirming it is made. By the Certificate issued under Rule 94, the Court is formally declaring the effect of the same and is not extinguishing or creating title, the object of issuance of such certificate being to avoid any controversy with respect to identity of the property sold and of the purchaser thereof as also the date when the sale became absolute. The use of past tense in the rules stating that the sale "became" absolute was held to