The term "motor vehicle junk yard" shall include any place of storage or deposit, whether in connection with another business or not, which displays, or in or upon which are displayed, to view from the public highway two or more unregistered motor vehicles which are unfit for reconditioning for use on the public highways, used parts of motor vehicles, old iron, metal, glass, paper, cordage or other waste, discarded or secondhand material which has been a part or is intended to be a part of any motor vehicles, the sum of which parts or material shall be equal in bulk to two or more motor vehicles.