Jani has an interesting find on a drilling variant by Hans Brings from the early 1890s and in looking for a patent or DRGM for Brings(had a bicycle patent in Britain) I stumbled onto Gebrauchsmuster/D.R.G.M. Nr. 17912 & 17913 where Sauer sought protection.

Gebrauchsmuster 17912 - filed 9.25.1893 and issued 8.12.1896 under the term Selbstspannerschloß u.f.w.




Gebrauchsmuster 17913 - filed 9.25.1893 and issued 8.12.1896 under the term Selbstspannergewehrschloß u.f.w.

I wonder what the difference in the novel idea might have been for the Selbstspanner. Maybe one for the lock & one for the indicator?

Kind Regards,

Raimey
rse