Must have been a short lived concern or there's additional info elsewhere seeing there were 4 brothers Krieger, Karl, Max, Peter & Oskar, all of Berlin, along w/ technical whiz Franz Gndig. Gebrder Krieger might just represent the trademark of K inside a G w/ an arrow thru it or it could represent the addition of Gndig after WWI. Karl was the chauffeur of Kaiser Wilhelm II and a thrill seeker. All were pioneers in aviation up until WWI put a damper on that, so they turned to motorcycles. But Karl Krieger received a donated engine from Kaiser Wilhelm II, constructed his own plane & then was Nr. 113 in obtaining his pilot's license. He met his demise as a test pilot in the latter part of WWI.
So Gebrder Krieger, being now Max, Peter & Oskar Krieger partner with designer Franz Gndig in 1919 and transition from aviation to motorcycles. They were ahead of their time in design & Germany with is economic troubles, saw fierce competition in the motorcycle realm so the concern was absorbed in 1922. There were a couple more name changes & in 1927 when Paul Henkel Fahrradbau acquired the evolution of the original business and moved it to Mbendorf near Suhl. Franz Gndig left the partnership at this time & the whole of the ship sank in 1932 when Paul Henkel commited suicide in 1932. This was the motorcycle wing....
Cheers,
Raimey
rse
