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ID = 28639
Tube type:  Triode, vacuum 
  <1925 very rare. ***
Identical to RMR
First year Sep.1921 70 Years of Radiotubes and V.
Predecessor Tubes I-T-E-V  


Distributed and possibly manufactrured by H W Sullivan - the "Improved Pattern Valve" Inverted bowl anode and a tapered spiral grid matching the contour of the anode. Designed to overcome the patent on the tubular anoded "R" valve. Stokes - p208

It is possible that this was manufactured by "Rivers Moore" - hence the name. "Wireless Weekly (UK) June 6 1923".

Information source 70 Years of Radiotubes and V.   

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