Bobbin casing assembly and sewing machine having same
Bobbin changer apparatus for sewing machine
Bobbin exchanger
Bobbin loading apparatus for sewing machines
Bobbin thread case opener
Bobbin thread control means for a lock stitch sewing machine
Bobbin thread pull-off for lockstitch looptaker
Bobbin thread tension device
Bobbin winder arrangement for sewing machine looptaker
Bobbin winding mechanism for a sewing machine
Button hole sewing device
Buttonholder for zigzag sewing machine