[Code of Federal Regulations] [Title 29, Volume 4] [Revised as of July 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 29CFR1205.4] [Page 16] TITLE 29--LABOR BOARD PART 1205--NOTICES IN RE: RAILWAY LABOR ACT--Table of Contents Sec. 1205.4 Substantive rules. The only substantive rules issued by the National Mediation Board are those authorized under section 2, Ninth, of the Railway Labor Act to implement the procedure of determining employee representation. [12 FR 2451, April 16, 1947. Redesignated at 13 FR 8740, Dec. 30, 1948, as amended at 64 FR 40287, July 26, 1999]