Roytron was another Triad spinoff! It is printed right on the Roytron box eamples I have found that states "Manufactured by Triad Manufaturing Company, Pawtucket RI.

On February 28th, 1929, Triad filed a trademark for the Roytron logo for vacuum tubes produced under that name.

Roytron tradmark record
Official Gazette Of The
United States Patent Office
Volume 393 April 1930

Click to enlarge Roytron produced by Triad

Click to enlarge Roytron produced by Triad	Click to enlarge Roytron produced by Triad
Click to enlarge Roytron produced by Triad	Click to enlarge Roytron produced by Triad

Click to enlarge Roytron produced by Triad

Click to enlarge Roytron 201A produced by Triad

Click to enlarge Roytron 80 produced by Triad

Click to enlarge Roytron 227 produced by Triad

Click to enlarge Roytron 80 produced by Triad

Click to enlarge Roytron 78 produced by Triad

Roytron 80 produced by Triad

Click to enlarge Journal and Courier September 21st 1931	Click to enlarge The Evening Sun September 4th 1934
Click to enlarge Journal and Courier September 18th 1931	Click to enlarge The Evening Sun September 25th 1931
The Evening Sun October 21st 1931	The Morning Herald September 21st 1934