National Radio Products 1941 No. 400

The National Radio Products Bulletins are the product catalogs of the National Company, and include their radio parts for building and experimenting, as well as, their recievers, transmitters, and other equipment. Typically, these catalogs ran from 16 to 20 pages. The catalogs were published once or twice a year.  In the 1940s, the catalogs became annual, and they dropped the word "Bulletin" and "No. XXX" from the title, using the year instead.

Bulletins No. 220 and No. 240 were publsihed in their entirity in the October 1933 and 1934 issues respectively. Starting in the mid-1930s, the Bulletins were published in the catalog section of the ARRL's Radio Amateur's Handbook, where it was a mainstay for many years.