It shall be unlawful for any junk dealer or the owner or manager of any junk shop or junk yard in the city to purchase or receive any article of junk from any minor without first having obtained the written consent of the parent or guardian for the sale or transfer. If the minor has neither parent nor guardian, then the junk dealer shall require the written statement of some responsible person that the article, machinery, implement, or old automobile is the property of the minor and is not stolen property.
(`81 Code, § 117.17) Penalty, see § 117.99