23 [ FAMILY AND ] COMMERCIAL SEWING MACHINES; DARNING, EMBROIDERY, ARTICLE FASTENING, HEMSTITCHING, BUTTONHOLE MAKING, EYELETTING, AND ORNAMENTAL STITCHING MACHINES; BOBBIN WINDING, [ CRIMPING, ] STRIP CUTTING, PRESSING, STRIP WINDING, [ THREAD DRAWING, ] TRIMMING, PLEATING AND GRINDING MACHINES; SEWING MACHINE NEEDLES; AIR BLOWING APPARATUS EMPLOYED FOR SEWING MACHINE NEEDLE COOLING AND LINT-DISPERSING; LOOP-FORMING IMPLEMENTS, BELT PUNCHES, HONING DEVICES FOR SHARPENING KNIFE BLADES, BELT TIGHTENERS FOR REMOVING THE SLACK FROM POWER TRANSMISSION BELTS, SCISSORS, HAND AND POWER OPERATED CLOTH PINKING DEVICES, WRENCHES, SCREWDRIVERS, C-CLAMPS, CLOTH GRIPPERS FOR SECURING A WORK MATERIAL TO OR UPON A TABLE, WORKHOLDING IMPLEMENTS FOR HOLDING AND PRESENTING WORK MATERIAL TO A SEWING MACHINE, CUTTER BLADES FOR HAND AND POWER OPERATED CUTTING DEVICES, FINGER GUARDS IN THE FORM OF METAL OR GLASS SCREENS FOR PREVENTING THE MOVEMENT OF AN OPERATOR'S FINGERS BENEATH STITCHING OR CUTTING INSTRUMENTALITIES, THREAD LUBRICATORS FOR FURNISHING AND APPLYING LUBRICANT TO A SEWING THREAD, STILETTOS, TWEEZERS FOR SEWING USE, AND SEAM RIPPERS; STOCKING DARNERS AND FAGOTTING UNITS ABOUT WHICH CORD MAY BE WOUND BEFORE STITCHING SAME; SEWING MACHINE ATTACHMENTS INCLUDING, EMBROIDERY, EDGE STITCHING, MULTIPLE SLOTTED BINDER, BLIND STITCH, ZIGZAG HEM-STITCHING, BUTTONHOLER, BINDING, GATHERING, HEMMING, RUFFLING, BRAIDING, BLIND-STITCH BRAIDING, FLANGE HEMMING, QUILTING, SHIRRING PLATE, TUBULAR TRIMMING TUCKING, CORDING, ZIPPER FOOT, DARNING FOOT, UNDERBRAIDING, BIAS GAUGE, CLOTH GUIDING, BIAS BINDING, SCROLL HEMMING, ORNAMENTAL STITCHING, AND THREAD-CHAIN CUTTERS; SEWING MACHINE POWER TABLES AND STANDS; FITTED CANVAS AND BENT WOODEN COVERS, AND PORTABLE CARRYING CASES FOR SEWING MACHINES; AND GREASE GUNS; AND PARTS THEREFOR