the constitutional provisions that no person shall be deprived of his property without due process of law2 and that no person shall be denied the equal protection of the laws3 would have no meaning as applied to associations or partnership and alien heirs of an alien engaged in the retail business if they were to be compelled to sell or dispose of their business within ten years from the date of the approval of the act and before the end of the term of the existence of the associations and partnership as agreed upon by the associations and partners and within six months after the death of their predecessor-in-interest .