Article 4. In case any representative of a juridical person or a proxy, an employee or any other worker of a juridical or natural person commits a voilating act of the provision of the preceding Article for the business of the said juridical or natural person, not only the offender but the juridical or natural person concerned shall be liable to a fine under the same Article;provided that this shall not apply to the said juridical or natural person, in case it is proved that due care and supervision have been exercised in connection with the business of the said juridical or natural person in order to prevent such violation by the proxy, employee or other worker thereof.