What are some companies that only manufacture one product, with little or no variations?

Crocs makes tote bags, backpacks, and cross-body bags.

So we must argue over everything,  even Crocs.  

So, pointing out to you that Crocs makes items other than shoes is arguing?  Maybe if you did your homework and made sure that what you post is accurate,  no one would have to correct you.  You just can't stand to be wrong, can you.  I wonder if that's why there's hardly anyone on here these days.