Baumgarten:
Have seen the reference a time or two & collected a bit of ground truth, but it seems Kreiger & Gnädig were tube makers and used the trademark of a K enclosed by a G in the quadrilateral form. So anyone w/ a longarm w/ German tubes that has a brace of "Boxed Ks", come forward as I'd like to view them to see if indeed there are 2 concerns here: one being Kreiger & Gnädig w/ the K inside a G and another(Klett - K mechanic) that has just the "Boxed K".
Kreiger & Gnädig looks to have been active from WWI forward.
Cheers,
Raimey
rse
