The General lien is not applicable to which of the following?

Indian Contract Act: Section 171. General lien of bankers, factors, wharfingers, attorneys and policy-brokers: Bankers, factors, wharfingers, attorneys of a High Court and policy-brokers may, in the absence of a contract to the contrary, retain as a security for a general balance of account, any goods bailed to them; but no other persons have a right to retain, as a security for such balance, goods bailed to them, unless there is an express contract to that effect.