- Full Title: Radio Service Bulletin, No. 172 (July 31, 1931)
- Document Type(s): News Release
- Bureau(s): Media
Issued by the Radio Division, Department of Commerce. Visit <a href='https://www.fcc.gov/media/radio/radio-service-bulletins'>Radio Service Bulletins (1915-1932)</a> for a list of bulletins (#1 to #183) available here.
- Released On: Jul 31, 1931
- Issued On: Jul 31, 1931