[Fresh Wind]

Without the Fleming Valve, the Audion would never have existed. And without the Edison incandescent bulb, the Fleming Valve would never have existed.

[Steely Tom]

Without the Fleming Valve, the Audion would never have existed. And without the Edison incandescent bulb, the Fleming Valve would never have existed.

Yes, in a SF short story I read as a kid, the author identifies Edison as the inventor of the "monode."

And I forgot about the Fleming Valve, thanks for mentioning it.