understandable how can it be said that equitable considerations have no place where a claim is made under the said provision. What those equitable considerations should be is not a matter of law. That depends upon the facts of each case. But to say that equitable considerations have no place where a claim is founded upon Section 72 is, in our respectful opinion, a contradiction in terms. Indeed, in Kanhaiyalal, the Court accepts that the right to recover the taxes - or the obligation of the State to refund such taxes – under Section 72 of the Contract Act is subject to "questions of estoppel, waiver, limitation or the like", but at the same time, the decision holds that equitable considerations cannot be imported because of the clear and unambiguous language of Section 72. With great respect, we think that a certain amount of inconsistency is involved in the aforesaid two propositions. "Estoppel, waiver...or the like", though rules of evidence, are yet based upon rules of equity and good conscience. So is Section 72. We are, therefore, of the opinion that equitable considerations cannot be held to be irrelevant where a claim for refund is made under Section 72. Now, one of the equitable considerations may be the fact that the person claiming the refund has passed on the burden of duty to another. In other words, the person claiming the refund has not really suffered any prejudice or loss. If so, there is no question of reimbursing him. He cannot be re compensated for what he has not lost. The loser, if any, is the person who has really borne the burden of duty; the manufacturer who is the claimant has certainly not borne the duty notwithstanding the fact that it is he who has paid the duty. Where such a claim is made, it would be wholly permissible for the court to call upon the petitioner/plaintiff to establish that he has not passed on the burden of duty to a third party and to deny the relief of refund if he is not able to establish the same, as has been done by this Court in I.T.C. In this connection, it is necessary to remember that whether the burden of the duty has been passed on to a third party is a matter within the exclusive knowledge of the manufacturer. He has the relevant evidence - best evidence - in his possession. Nobody else can be reasonably called upon to prove that fact. Since the manufacturer is claiming the refund and also because the fact of passing on the burden of duty is within his special and exclusive knowledge, it is for him to allege and establish that he has not passed on the duty to a third party. This is the requirement which flows from the fact that Section 72 is an equitable provision