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  US3628252A - Drafting apparatus - Google Patents

  http://www.google.de/patents?vid=USPAT3628252&id=CK4sAAAAEBAJ&dq=%22DIN+6775%22&num=100

  A drafting apparatus comprises a support mounted for predetermined movement above and with reference to a paper on which drafting is to take place. A plurality of drafting pens are provided each of which has a line-forming contact portion of…

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  US2735900A - hans-christoph wohlrab etal - Google Patents

  http://www.google.de/patents/US2735900

  Keine Beschreibung vorhanden.

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  William Crawley-Boevey - Bielefeld University

  https://www.math.uni-bielefeld.de/~wcrawley/

  Keine Beschreibung vorhanden.

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  US1781081A - Electrical aerial advertising sign - Google Patents

  http://www.google.de/patents?id=YwpQAAAAEBAJ&printsec=abstract&zoom=4

  Keine Beschreibung vorhanden.

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  DISKUS: Kim Knott

  https://web.archive.org/web/20080511142303/http://web.uni-marburg.de/religionswissenschaft/journal/diskus/knott.html

  Keine Beschreibung vorhanden.

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