" 11 . ….Engagement and appointment in service can be established directly by the existence and production of an appointment letter, a written agreement or by circumstantial evidence of incidental and ancillary records which would be in the nature of attendance register, salary registers, leave records, deposit of Provident Fund contribution and Employees' State Insurance contributions etc. The same can be produced and proved by the workman or he can call for and caused the same to be produced and by calling for witnesses who are required to bring and prove these records. The workman should make an appropriate application calling upon the management to call such records in respect of his employment to be produced. In these circumstances, if the management fails to produce such records, an adverse inference is liable to be drawn against the management and in favour of the workman."