I believe that Dwight is including firms (Simson & Kreighoff) with reworking efforts before they had the machinery to build complete lugers. To trace the latter, just follow the machinery: DWM from 1898 until the end of WW1. Then reorganized as BKIW until about 1933 when their machinery went to Mauser thru 1942, when they switched over to P38 production and sent all of their spare PO8 parts to either KH or a Luftwaffe depot to make the KU lugers. Erfurt began production in late 1910 thru the end of WW1 (1918), and soon there after their machinery went to Simson to begin production in 1925, until nationalized by the Nazis (Jewish firm) in about 1933 and Kreighoff received their machinery to begin production in late 1935 thru the end of WW2 in small lots for the Luftwaffe, and continued to assemble their left over spare parts (DWM, Erfurt, Simson, etc) under allied control for a few years after the war. The third and final set of machinery was made by the Swiss in 1916 due to no longer being able to get luger from Germany during WW1 and redesigned it prior to 1929 to produce a simpler to manufacture M1929, made thru 1949. This is the machinery sold to Mauser to produce their postwar Parabellum starting in 1970, which then had to be updated in 1971 to make the PO8 style pistol. Vickers and Spandau were not true manufactures. They just assembled existing DWM or Erfurt parts with their own toggle links, after WW1. TH
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