Can opener patent
My nemesis: Patent US1838525A (1931)*

*As a left-handed person, the humble can opener is the bane of my existence. It represents one of my earliest and most frustrating user experiences to date. It is a daily reminder that users know their needs best and it is always possible to come up with a better design. I am the proud owner of an electric can opener, which has changed my life.

Signs of life