Does 'In this period, a number of key technological changes  sewing machines that made many more stitches a minute, long knives instead of shears for cutting, and pressing machines.' logically set the stage for the hypothesis 'Industry tools and machineries have stayed the same until today.'
In this period, a number of key technological changes  sewing machines that made many more stitches a minute, long knives instead of shears for cutting, and pressing machines.###Industry tools and machineries have stayed the same until today.