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• Patent GB-1912-10714
  |Inventors=Louis Dobbertin |Applicant person=Dobbertin LOUIS
  589 bytes (71 words) - 00:20, 8 December 2019
• Patent FR-1912-443448
  |Inventors=Louis Dobbertin; Albert Fredrich Dobbertin |Applicant person=Louis Dobbertin; Albert Fredrich Dobbertin
  1 KB (128 words) - 21:48, 28 January 2024
• Patent US-1912-1015150
  |Inventors=Louis Dobbertin |Applicant person=Dobbertin LOUIS
  1 KB (164 words) - 23:37, 3 October 2019