Oki printer ribbons

Because oki printer ribbons  and many manufacturers, as in the dot matrix printer ribbon, the use of the structure of "Möbius band", is to a ribbon joints, rotate 180 degrees, even in together. Such an end to think even the ribbon, the ribbon length of the actual use of doubling the length of the ribbon used originally unilateral, bilateral become used ribbon. Thereby increasing the life, this is the famous "Mobius loop" Year 1858, Mobius found: 180 ° twist to a two bonded to a piece of paper and then, with the magic of nature. Take a long white piece of paper, painted black on one side, then turn over the one end, along with scissors to cut the tape central to it. You will be surprised to find that not only did the tape into two parts, but as a figure twice as long as the cut paper circle! Interesting: newly obtained this longer paper circle, itself is a double-sided surface, its two border itself, though not tied, but mutually nested together.