Subclass 1/28: Spinning or twisting machines in which the product is wound-up continuously (open-end spinning machines D01H 4/00) Details (drafting arrangements D01H 5/00; twisting arrangements D01H 7/00) Driving or stopping arrangements (for open-end spinning machines D01H 4/12, D01H 4/2, D01H 4/42; safety devices D01H 13/14) for two or more machine elements possessing different characteristics but in operative association