Research approval under section 35: association must maintain records, file annual return and submit audited research accounts. Approval is granted to the Centre for Materials for Electronics Technology as an Association under sub-section (1) of section 35 of the Income-tax Act for research exemption, subject to maintaining separate books of account for research (unless exempt for associations), filing an annual return of research activities with the Secretary, Department of Scientific and Industrial Research by 31 May, and submitting audited annual accounts and audited income and expenditure accounts for research to specified tax and DSIR authorities by 31 October each year.