These mounts are known as "Triebel - Schwenkmontage" = Triebel's pivot mount. These were custom made by Rudi Triebel (+1984), Kaufbeuren, Bavaria, in the 1960s - 70s. They are the predecessors of the EAW and other German pivot mounts. A completely different variation of the claw mount is also known as "Triebel -Montage", but these prewar mounts were made by Albert Wilhelm Triebel, Suhl. Triebel is a rather frequent name in the German guntrade, as 47 persons/companies so named are known.
BTW, DRGM (pre-45)and DBGM (post45)are not really German patents. They are best described as "registered and protected designs".