Section 4B. No person, firm, corporation or association, other than an agency or instrumentality of the United States government, selling or offering for sale goods, wares or merchandise, shall use, or cause or permit to be used, in the corporate or trade name thereof, or in the description of the seller or of the place where the goods, wares or merchandise are offered for sale or sold, the words or phrases ''Army'', ''Navy'', ''Marine Corps'', ''Marines'', ''Coast Guard'', ''Government'', ''Post Exchange'', ''P?X'' or ''G. I.'', or any of such words or phrases, or any word or phrase which may lead the public to believe that the seller or his or its place of business is owned, operated or managed by the United States government or any agency thereof; provided, that said words or phrases may be used in the corporate name of a corporation organized under the provisions of chapter one hundred and eighty if such use is approved by the state secretary. No person, firm, corporation or association, other than an agency or instrumentality of the commonwealth shall use the words ''Massachusetts State Fair'' or any such words or phrases without the written consent of the commissioner of agriculture.