PLYMOUTH – Like a placid summer lake accented by the drone of bees, North Plymouth’s gentle bustle felt hardly a ripple from a bus or car that rolled through its center back in 1966. The Plymouth Cordage Company had finally closed after 140 years of drawing Portuguese, Italian and German immigrants into Plymouth’s northern folds – people who had settled into the corridor where they opened the requisite grocery store, pharmacy, shoe store, clothing and furniture stores and restaurants, and attended Mass at St. Mary’s.