"Strimmer" is a Black and Decker trademark. Check out this page on their website, for example ...
http://www.blackandde...rview/hierarchy/2212/
Title: "Strimmer® String Trimmers - Heavy Duty"
Note the ®. This is a good example of the use of Strimmer and trimmer in the same sentence - because strimmers are a brand of string trimmer, owned by Black and Decker. You won't find any other garden machinery manufacturer that describes their product as a "strimmer", because they can't. Retailers, on the other hand, often use the word "strimmer" to describe products from other manufacturers since that's the word that lots of their customers use and they're there to sell product, not enforce trademarks. It's like asking for Coke and getting Pepsi ...