Between 1852 and 1887, the U.S. patent office gave out over 100 patents for clothespins. The patents began losing their value after 1938, which just so happened to be the year that the first electric clothes dryer went on sale.
Between 1852 and 1887, the U.S. patent office gave out over 100 patents for clothespins. The patents began losing their value after 1938, which just so happened to be the year that the first electric clothes dryer went on sale.
Nenhum comentário:
Postar um comentário