Section 19. Whoever, by himself or by his servant or agent, or as the servantor agent of another person, sells any can or container to be used in the purchase or sale of milk or cream at wholesale that is not marked and sealed as required by the preceding section, shall be punished by a fine not exceeding ten dollars for each can or container so sold or shall be subject to a civil citation as provided in section 29A. Whoever, by himself or by his servant or agent, or as the servant or agent of another person, uses any can or container in the purchase or sale of milk or cream at wholesale that is not marked and sealed as required by the preceding section, shall be punished by a fine not exceeding ten dollars for each offense or shall be subject to a civil citation as provided in section 29A. The deputy director, inspectors and sealers shall enforce the provisions of this and the preceding section.