New York Consolidated Laws, General City Law - GCT § 45-a. Corporations may conduct business

A domestic corporation desiring or intending to conduct the trade, business or calling of a plumber or of plumbing in a city of this state, as employing or master plumber, may do so provided one or more officers of such corporation separately or aggregately actually hold and own at least fifty-one per centum of the issued and outstanding capital stock of said corporation, and provided that each of such officers holding such percentage of the stock is the holder of a certificate of competency of such board of the city in which it conducts or proposes to conduct such business as provided in section forty-five. In case one or more officers of a corporation engaged in such business shall die, being the holder of a certificate of competency, the corporation may continue the business during the time necessarily required for the administration of the estate of such deceased officer, not exceeding two years from the granting of letters, provided one or more officers of the corporation is the holder of a certificate of competency and together with the legal representatives of such deceased officer or officers, actually owns and holds at least fifty-one per centum of the issued and outstanding capital stock of the said corporation. Each and every member of said corporation holding a certificate of competency shall comply with all the rules and regulations applicable to master or employing plumbers in the locality in which the corporation is engaged in business. Such corporation shall register as provided in section forty-six of this chapter.