Each private hospital, public hospital society or corporation receiving state aid shall, upon the demand of any patient who has been treated in such hospital and after his discharge therefrom, permit such patient or his physician or authorized attorney to examine the hospital record, including the history, bedside notes, charts, pictures and plates kept in connection with the treatment of such patient, and permit copies of such history, bedside notes and charts to be made by such patient, his physician or authorized attorney. If any such hospital, society or corporation is served with a subpoena issued by competent authority directing the production of such hospital record in connection with any proceedings in any court, the hospital, society or corporation upon which such subpoena is served may, except where such record pertains to a mentally ill patient, deliver such record or at its option a copy thereof to the clerk of such court. Such clerk shall give a receipt for the same, shall be responsible for the safekeeping thereof, shall not permit the same to be removed from the premises of the court and shall notify the hospital to call for the same when it is no longer needed for use in court. Any such record or copy so delivered to such clerk shall be sealed in an envelope which shall indicate the name of the patient, the name of the attorney subpoenaing the same and the title of the case referred to in the subpoena. No such record or copy shall be open to inspection by any person except upon the order of a judge of the court concerned, and any such record or copy shall at all times be subject to the order of such judge. Any and all parts of any such record or copy, if not otherwise inadmissible, shall be admitted in evidence without any preliminary testimony, if there is attached thereto the certification in affidavit form of the person in charge of the record room of the hospital or his authorized assistant indicating that such record or copy is the original record or a copy thereof, made in the regular course of the business of the hospital, and that it was the regular course of such business to make such record at the time of the transactions, occurrences or events recorded therein or within a reasonable time thereafter. A subpoena directing production of such hospital record shall be served not less than twenty-four hours before the time for production, provided such subpoena shall be valid if served less than twenty-four hours before the time of production if written notice of intent to serve such subpoena has been delivered to the person in charge of the record room of such hospital not less than twenty-four hours nor more than two weeks before such time for production.