Section 18 in The Post Office Savings Certificates Rules, 1960
18. Conversion from `A' type Certificate to "B" Type Certificate and vice -versa.
- (i) A joint `A' Type Certificate may be converted into a joint `B' Type Certificate in the names of the same holders;(ii)A joint `B' Type Certificate may be converted into a joint `A' Type Certificate in the names of the same holders.
