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Excuse me, when making a house, what is the machine that straightens the steel bar 'six yards? Called Steel straightening machine.

How did the needles taken in ancient sewing clothes be made? Iron and bones should be ground out. ''' There is a way to grind iron bars into needles. ''' the texture should be pig iron and the like ''' ''the bones are unlikely'' ''' embroidery needle ''bone is too bloody'' should not be used for embroidery ''bone,Upstairs,How could it not be??The earliest was the stone, the earliest was the bone, and the Beast bones that came back from hunting were used to make ancient times,Our ancestors learned to sew simple clothes such as animal skin and leaves with fishbone needles and stone needles,With the development of iron and metal manufacturing technology,People gradually learned to use metal needles to sew clothes,The shape has also been greatly improved,And has been used so far.The earliest sewing machine was to sew cloth or leather with single, double and multiple wires and machine needles,Or sew a machine with decorative thread marks on the seam material.For home, industrial and service companies.After the mid