U.S.tube manufacturers licensed by RCA in 1930

In the April 8th 1930 issue of the Wall Street Journal, page 2, under the heading "Broad Street Gossip" is this short article headed "Radio Operation"  - It says: "Fourteen Radio Tube Manufacturing Companies are licensed under the patents of the Radio Corporation of America. These are:

Allan Manufaturing and Electric Corporation (Alltron and Vogue tubes)

Cable Radio Tube Corporation (Speed tubes)

Ceco Manufacturing Company Inc (Ceco tubes)

Champion Radio Works Inc (Champion tubes)

Hygrade Lamp Company (Sylvania tubes)

Ken-Rad Corporation (Ken-Rad tubes)

Matchless Electric Company (Matchless tubes)

National Union Radio Tube Corporation (National Union tubes)

Nilco Lamp Works (Neptron, Hygrade and Sylvania)* 

Perryman Electric Company (Perryman tubes)

Raytheon Manufacturing Company (Raytheon tubes)

Triad anufacturing Company Inc (Triad tubes)

Tung-Sol Radio Tubes Inc (Tung-Sol tubes)

United Radio and Electrical Corporation (Ureco tubes)"

Readers please note that tube brand names were not listed in the article but have been added  by the author, from Tynes' book "Saga of the Vacuum Tube, pages 351 - 365

* The Novelty Incandescent Lamp Co (Nilco) also known as Sylvania Products Company from 1924 to 1931 made tubes from 1924. 

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