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§ 3. Except as otherwise provided in this act, it shall be unlawful for any person within this state to possess or have in his possession any machine gun . . . § 4. The unlawful concealed carrying upon the person or within the vehicle of the carrier of any machine gun, pistol, revolver or other firearm capable of being concealed upon the person is a nuisance. Any such weapons taken from the person or vehicle of any person unlawfully carrying the same are herby declared to be nuisances, and shall be surrendered to the magistrate before whom said person shall be taken . . .