§ 9. Subpoenas; oaths. The comptroller, deputy comptrollers and assistant deputy comptroller, or either of them, may issue a subpoena or subpoenas requiring a person or persons to attend before the comptroller, a deputy comptroller or assistant deputy comptroller and be examined in reference to any matter within the scope of the inquiry or investigation being conducted by the comptroller, and, in a proper case, to bring with him, a book or paper. A subpoena issued under this section shall be regulated by the civil practice law and rules. The comptroller and deputy comptroller or assistant deputy comptroller or any person designated in writing by them may administer an oath to a witness in any such inquiry or investigation.

This § of the general municipal law.