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…