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Blackstone Radio Tube Manufacturing Company
circa 1925 - 1935
The Blackstone Radio Tube Manufacturing Company of Pawtucket, Rhode Island, was active in the 1930s and maybe earlier. In 1934 and 1935, Abraham S. Friedman (b. 1906) was associated with the firm.
Blackstone Radio Tube Manufacturing Company, Rhode Island Radio, http://www.61thriftpower.com/riradio/blackstone.shtml (accessed 07/06/2016)