(c)likewise the licensee shall ensure that the denatured spirit to be sold to an educational and research institution or a furniture, polish dealer, private hospital, dispensary or registered medical practitioner does not exceed ten litres. In all such cases the licensee shall obtain a written requisition in which, inter alia, the quantity already in possession of the applicant shall be mentioned. Particulars of all such sales shall be entered in a separate register and all such requisitions and the register shall be checked by the Inspector of the area.