10 jul 1871 ano - square bottomed paper bags

Descrição:

Margaret Knight realized that paper bags without square bottoms weren’t all that useful, so she invented a machine to cut and attach flat bottoms to bags. Before she could patent the iron version of her machine, a man named Charles Annan stole her design, claiming that no woman could think of something so complex. Knight filed a lawsuit against him and proved that the prototype was in fact hers. She gained the patent in 1871.

Adicionado na linha do tempo:

Data: