Max Knoll seems to have hung out shingles in Berlin, Liege & Suhl. He began in 1887 and it may have been a joint effort with H. Leue but he appears to have 1 foot in Suhl & the other in Liege till say 1921. He had several patents as well as at least one D.R.G.M. being Nr. 419210 of 1908/1909 for attaching multiple tubes of sporting weapons. He more than likely will have other D.R.G.M.s. In 1921/1922 he looks to have concentrated his effort to Berlin. Hard to tell as he disappears in the shadows from time to time.

http://www.littlegun.be/arme%20belge/artisans%20identifies%20i%20j%20k/a%20knoll%20gb.htm

For the moment and until additional info is gleaned, the action may be that of Carl Lohse, being D.R.P. 174828 of 1904, under Max Knoll's umbrella:

http://www.littlegun.be/arme%20belge/artisans%20identifies%20l/a%20leue%20et%20knoll%20gb.htm


Kind Regards,

Raimey
rse