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George H. Porell Co.

George H. Porell Company, Boston, Massachusetts, USA

d/b/a Mastertone Radio Company, Boston, Massachusetts, USA


First seen: 18-Dec-1923
Last seen: 31-Dec-1920

Brand(s): Mastertone

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Mastertone variants:

 
B
R
A
N
D
201-A
1
Tube
{v1} Globe, short bakelite base, tipless


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Bibliography references:
  1. The Official Gazette of the US Patent Office, vol. 321, 01-Apr-1924, pg. 34. From Hathitrust.org Retrieved 02-May-2019 *
  2. Jun-1929, pg. 267. From AmericanRadioHistory.com. Retrieved 30-Nov-2018. !

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