What accomplishments did Jan Ernst Matzeliger have?

Answer 1

He invented the shoe-lasting machine. Many believed that the last step in shoe making, the stretching the shoe upper leather over a last (a form or block is the shape of a foot) and the sewing together of the shoe upper to the sole called the lasting, could not be done by machine. However, that's just what the lasting machine did. It decreased the price of shoes by a half and increased the production of shoes form 50 or less shoes per day to 150 -700 shoes per day. As for shoemakers, the invention brought them twice the pay they got before the machine. He also invented the tack separating and distributing mechanism, nailing machine, and another lasting machine.