Plomb and Plumb had a gentleman’s agreement for years that Plomb would not sell hammers as that was Plumb’s primary business.
Plomb started making hammers, Plumb got pissed, filed a lawsuit, and won. Plomb tried to be clever with their marketing, got sued again, lost again, ended up being Proto, and had to forfeit a large part of a years profits for their violation.
Proto thrives in the years following and continues to do so today. Plumb got bought out, and is now cheap Chinese crap like just about everything Apex Tool ever touched.