It's a very economic and sparse way of saying "floor grinder rental", no need to feel jealous about it, you Amis!
And of course the double-S is key though our typewriters and keyboarders no longer feature the old symbol for it, only some 75% Jewish origin US rock bands do that.
Unless they tour Germany, in which case they have to use a different logo to avoid committing a misdemeanor/criminal offense. (Presenting the SS runes is outlawed in Germany except in a historical or satirical context.)
Gene Simmoms says he always marvels about that.