The term "person" as used in this chapter shall be held to mean and include natural persons of either sex, firms, co-partnerships and corporations, whether acting by themselves or by servant, agent or employee. The singular number shall include the plural and the masculine pronoun shall include the feminine. The term "advertise" as used in this chapter shall be held and construed to include the making, displaying, publishing, disseminating or circulating of any public announcement of an offer to sell anything whatever in any newspaper, periodical, magazine, pamphlet, bulletin, circular letter, or upon any placard, poster, sign, picture, or hand bill, or in or upon any other advertising medium whatsoever, whether like or unlike those hereinbefore enumerated.