Sir,
Section 19(5)(c) talks of goods sold as such or goods used in manufacture of other goods (Goods other than the goods specified in the Registration certificate) in the course of interstate trade. Thus reversal of credit citing this provision is completely ruled out as your client is manufacturing taxable goods (i.e. goods which are specified in the Registration certificate).
Section 19(2)(v) talks of input tax credit availability in the case of goods specified in the registration certificate sold in the course of Interstate transfer. Since, your client is producing taxable goods specified in the registration certificate, as such reversal on this account is also ruled out.
You can explain to the Sales tax authority both the provisions as above read with Section 19(3) and convince that no reversal is required in the case of Capital goods used in manufacture of Taxable goods sold within the state as well as sold in the course of Inter State Trade.
Thanks