Blackstone Radio Tube Manufacturing Company
fl. 1933 - 1935
The Blackstone Radio Tube Manufacturing Company of Pawtucket, Rhode Island, was active in the 1930s, and perhaps earlier. In 1933 though 1935, Abraham S. Friedman (b. 1906) was in charge of the company.
RCA sued Blackston in 1933 for patent infringements. Boxmaker F. M. Howell & Company sued Blackstone in 1935.