As used in this chapter, the following terms shall have the meanings indicated:
Any person, partnership or corporation who, through any means, engages in the business of buying or selling secondhand gold, silver, precious metals or jewelry.
Any person compensated by salary, wage or commission by a dealer, as well as any partner of a partnership or general partner of a limited corporation or any officer or director of a corporation.
The making, through any means, of more than one offer to buy or sell any item or items of secondhand gold, silver, precious metals or jewelry in any ninety-day period. Any person, partnership or corporation which advertises for the purchase or sale of any of the aforementioned items shall be deemed to be "engaging in business."