c. a wholesale dealer in drugs to another such wholesale dealer or a retail dealer in drugs, or by such retail dealer to such wholesale dealer; d. a retail dealer in drugs to a duly licensed physician or to another person upon the written prescription of a duly licensed physician, or by such physician or person to such retail dealer. Section 245, to be amended by adding the following: _Provided that_: Any drug, medicine, article or thing designed, adapted, or intended for preventing conception, or any written or printed matter concerning the prevention of conception may be imported into, or exported from, the United States by a duly licensed physician, or may be transported in interstate commerce within the United States if consigned by a duly licensed physician: a. to another person known to him to be a duly licensed physician, or b. to one of his bonafide patients in the course of his professional practice. Any drug, medicine, article or thing designed, adapted, or intended for preventing conception may be imported into or exported from the United States by a person, firm, or corporation, including a manufacturer, engaged in an established legitimate business of importing and exporting drugs, or may be transported in interstate commerce within the United States, if carried or shipped in the regular course of legitimate business, by: a. an importer to a manufacturer or wholesale dealer in drugs, or by a manufacturer or wholesale dealer in drugs to an importer; b. a manufacturer to a wholesale dealer in drugs or by such wholesale dealer to a manufacturer; c. a wholesale dealer in drugs to another such wholesale dealer or a retail dealer in drugs, or by such retail dealer to such wholesale dealer; d. a retail dealer in drugs to a duly licensed physician or to another person upon the written prescription of a duly licensed physician, or by such physician or person to such retail dealer. Section 312, to be amended by adding the following: _Provided that_: The sale, loan, gift, exhibition or offer thereof, of any article, drug, instrument or thing, designed, adapted or intended for preventing conception, or the giving, writing or supplying of any oral, written or printed information concerning the preventing of conception, by a duly licensed physician to: a. another person known to him to be a duly licensed physician, or to b. one of his bonafide patients in the course of his professional practice;