law: National Bank for Agriculture and Rural Development Act, 1981 
  24. Investment
  
  credit-medium term.- 
  The National Bank shall provide such
  
  financial assistance as it may consider necessary by way of making to State
  
  co-operative banks, regional rural banks, loans and advances repayable on the
  
  expiry of fixed periods not being less than eighteen months and not exceeding
  
  seven years against such securities as may be specified, in this behalf, by the
  
  National Bank and such loans or advances may be made for agriculture, rural
  
  development or such other purposes as the National Bank may, from time to time,
  
  determine:
  Provided that no loan or advance shall be
  
  made under this section to a State co-operative bank unless such loan or
  
  advance is fully guaranteed as to the repayment of the principal and payment of
  
  interest, by the State Government but such guarantee may be waived by the
  
  National Bank, if other security to the satisfaction of the National Bank is
  
  furnished, or if, for reasons to be recorded by it in writing, the National
  
  Bank is satisfied that the guarantee or other security is not necessary.