If it shall appear that an agreement cannot be reached as provided in § 1703 of this title, or if 1 year shall have elapsed from the date of the election, the domicile of the decedent at the time of death solely for death tax purposes shall be determined as follows:

(1) Where only this State and 1 other state are involved, the Secretary of Finance and the taxing official of such other state shall each appoint a member of a board of arbitration, and the members so appointed shall select the third member of the board. If this State and more than 1 other state are involved, the taxing officials thereof shall agree upon the authorities charged with the duty of administering death tax laws in 3 states not involved, each of which shall appoint a member of the board. The members of the board shall elect a chairperson.

(2) Such board shall hold hearings at such places as are deemed necessary, upon reasonable notice to the executors, ancillary administrators, all interested persons and the taxing officials of the states involved, all of whom shall be entitled to be heard.

(3) Such board shall have power to administer oaths, take testimony, subpoena and require the attendance of witnesses and the production of books, papers and documents and issue commissions to take testimony. Subpoenas may be issued by any member of the board. Failure to obey a subpoena may be punished by a judge or justice of any court of record in the same manner as if the subpoena had been issued by such judge or justice or by the court in which such judge or justice functions.

(4) Such board shall apply, whenever practicable, the rules of evidence which prevail in federal courts under the Federal Rules of Civil Procedure at the time of the hearing.

(5) Such board shall, by majority vote, determine the domicile of the decedent at the time of death. Such determination shall be final and conclusive and shall bind this State and all of its judicial and administrative officials on all questions concerning the domicile of the decedent for death tax purposes.

(6) The reasonable compensation and expenses of the members of the board and employees thereof shall be agreed upon among such members, the taxing officials of the states involved and the executors. In the event an agreement cannot be reached, such compensation and expenses shall be determined by such taxing officials and, if they cannot agree, by the appropriate probate court of the state determined to be the domicile. Such amount shall be borne by the estate and shall be deemed an administration expense.

(7) The determination of such board and the record of its proceeding shall be filed with the authority having jurisdiction to assess the death tax in the state determined to be the domicile of the decedent and with the authorities which would have had jurisdiction to assess the death tax in each of the other states involved if the decedent had been found to be domiciled therein.

43 Del. Laws, c. 5, § 4; 30 Del. C. 1953, § 1704; 57 Del. Laws, c. 718, § 14; 57 Del. Laws, c. 741, §§ 7A, 7B; 70 Del. Laws, c. 186, § 1.