>Carborundum is generic, actually
In 1929 the Corborundum Company would have disagreed with you , it was a registered mark.
Like asprin , however, it has come into such general usage over time that it can no longer be protected as a trade mark...
If the green tool still has it's paper decal, it should have a circular mark with corborundum company written around the outside edge...
(I hardly ever find them with the decal still on them tho)
Branson is correct in Kitchen tool, I have seen them id'd as scythe sharpening tools, they are too short, you would cut off half your fingers sharpening a scythe with that thing;P