TYMPAN COVERS AND SHEETS COMPRISING A CLOTH, PAPER OR OTHER SHEET MATERIAL TO WHICH IS BONDED ROUNDED OR SPHERICAL BODIES OR PROTUBERANCES, SAID SHEETS BEING USED (1) AS A PRINTING ACCESSORY, TO PREVENT OFF-SET, TO PREVENT THE BUILDING UP OF STATIC CHARGES OF ELECTRICITY, TO GIVE A HARD SURFACE TO PRINT AGAINST OR TO PERFORATE AGAINST, AND THE LIKE, (2) AS A COVER FOR IDLER ROLLS, (3) AS PADS FOR ABRASIVE BELT SANDING MACHINES, AS COVERS ON MACHINES FOR COATING SHEETS OR FILMS TO PREVENT STATIC ACCUMULATION, (4) AS A SLIDE BETWEEN A MACHINE AND TABLE TO PREVENT FRICTION AND TO REDUCE STATIC CHRGES, (5) TO COVER RACK STICKS TO PREVENT TRANSFERRING OF COATING MATERIALS DURING FESTOONING OR DRYING OF COATED OR SHEETED PRODUCTS, AND FOR ANALOGOUS AND OTHER USED