(under the class definition) Subject matter wherein a belt* has a one-sided pulley*-engaging surface formed by holding a first end of an elongated band fixed, rotating the opposite end l80 degrees about an axis coincident with a centerline of the elongated band parallel to the long dimension thereof, and securing the opposite end to the first end.
SEE OR SEARCH CLASS
400, Typewriting Machines,
195, for a mobius strip typewritter ribbon, and see (1) Note therein for an explanation of mobius. [figure]