Section 9. Attendance of witnesses; fees

1. Witnesses shall be entitled to
  the same fees as are allowed in civil cases in courts of record.    Such
  fees need not be pre-paid, and shall be paid; (a) in the case of persons
  subpoenaed  by  the  state  civil  service  commission,  from  the state
  treasury on the audit and  warrant  of  the  comptroller  upon  vouchers
  approved  by  the  president  of  the  commission, or (b) in the case of
  persons subpoenaed by a municipal commission, in the manner provided  by
  law for the payment of the lawful expenses of such municipal commission.
    2. All  public  officers and their deputies and employees shall afford
  the state civil service  commission  and  any  municipal  civil  service
  commission   all  reasonable  facilities  in  conducting  the  inquiries
  authorized by this chapter, give inspection to such  commission  of  all
  books,  papers  and  documents  belonging  or in any way appertaining to
  their respective offices, produce said books and papers, and attend  and
  testify when required to do so by such commission.