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Pigling is the Rotary hook which solves the unsolved problem for 150 years.
The sewing machine has come a long way from its original conception 150 years ago. Since then the dozens of individual parts have been refined and improved over the years to coalesce into the machine that is known today. With no apparent further potential for optimization, the currently recognized sewing machine has remained the same for decades without modification or change.
5 Times More Bobbin Threads than conventional One:
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