4.2 Further, he has submitted that the appellant have claimed that they were manufacturing telecom racks which are integral part of BTS. In order to substantiate their claim, they produced letter from their client M/s. Ericsson, Technical Reports from SIT, Tumkur and IIT, Delhi. The letter issued by M/s. Ericsson cannot be taken as having any evidentiary value since the appellants were their suppliers and there is mutual interest involved. On the technical write-up of SIT, Tumkur and IIT, Delhi, the learned AR raising doubt on the said letters submitted that it contains same subject, paragraphs, wordings, lines, coma and full stop but only the letterheads, date and signature vary. Thus, it is a deliberate attempt by the appellant to place on record concocted evidence and misguide the Tribunal. On this ground alone, appeal is liable for dismissal. Further, he submitted that despite the said fact, even on merits, the adjudicating authority has considered the said two technical write-ups and it is evident from both the write-ups that the appellants are manufacturing only semi-finished parts and not parts of BTS. In support, he has