22 It can also be seen from Chan at 252, that the 1992 instrument will be treated by a court administering equity, in the circumstances of this case, as giving rise to an equitable lease for the term agreed upon which, as between the parties, is the equivalent of a lease at law, though the lessee does not have a lease at law in the sense of having a legal interest in the term. That proposition depends for its validity, in an individual case, on whether a court of equity would specifically enforce the agreement, but counsel for the defendants did not seek to argue that a court of equity would not do so in this case. However, it should be emphasised that even so, the obligations between the landlord and the tenant arise, not under the lease at law but under an equitable lease which is the equivalent of the lease at law. Chan at 256. Chan at 256 - 258, is also authority for the conclusion that the unregistered 1992 instrument itself was ineffective to create either a legal or equitable estate or interest in the land, before registration. It is an antecedent agreement ("the transaction behind the instrument": Brunker v Perpetual Trustee Co (Ltd) [1937] HCA 29; (1937) 57 CLR 555 at 581), evidenced by the unregistered 1992 instrument, not the instrument itself, which created the equitable estate or interest. In that way no violence is done to the statutory command of s49(1). What was said about this topic by the majority of the High Court, may not have been literally consistent with earlier curial statements. For example, in National Trustees, Executors and Agency Company of Australasia Ltd v Boyd [1926] HCA 44; (1926) 39 CLR 72, Knox CJ, Gavan Duffy and Rich JJ at 82 said that an instrument, without registration, operated only as a contract and not as a lease binding third parties, but nevertheless the instrument "operates, not merely to create contractual rights and duties, but to create an equitable term of years ... ". That is to say, it was there stated that the unregistered instrument itself creates the equitable estate or interest. Only four years before Chan's case, Mason J (as he then was), stated the position differently to Chan in Progressive Mailing House Pty Ltd v Tabali Pty Ltd [1985] HCA 14; (1985) 157 CLR 17 at 27, when he referred to the unregistered memorandum of lease in that case as bringing "into existence an equitable term of the duration which it specified and subject to the conditions which it contained". Nevertheless, I apply what was said more recently in Chan.