N.J. Stat. § 19:32-49
In addition to the foregoing, the superintendent of elections is constituted the commissioner of registration for the county and he shall, within the county, have and exercise all the powers of, and be charged with all the duties had and exercised and required to be performed by, the superintendent of elections and the commissioner of registration in any county, including the custody and control of voting machines heretofore or hereafter installed in the county in any manner provided by law, except those heretofore or hereafter installed in any municipality by the governing body thereof, which shall be placed and remain in the custody of the municipal clerk unless taken over by the county according to law. The deputy superintendent of elections in counties of the first class, and in counties of the second and fifth classes in which the governing body has established the office of superintendent of elections for the county, is constituted the deputy commissioner of registration.
N.J.S. § 19:32-49