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This looks good to me, but what's a "crusher"?

in French it must be "meule", I thought I saw "grinder", you know, to make some flour with wheat grains... Old ones are made in stone...

That sounds like a mill to me, but in French it's not "meule" - it's "broyeur" - what's the difference?

I think they are complementary ("meule" and "broyeur". I had a look to a pdf file where it was explained that it is one of the oldest tools, "meule" was a flat stone on which people used to put some grains (or also other stuf) on this flat stone, then the "broyeur" was a cobble-stone used to crush the grains on the "meule", by grinding, in order to obtain a flour, or any pulverized stuff (according to what they crushed)
The oldest "meules" and "broyeurs" found were made at the late neanderthal era...

Um - OK, but what is it now?

Here in Singapore, we call it a "grindstone". The term "millstone" is also used, but it's not as common as "grindstone".

It appears the "broyeur" is a "pestle" in English; a grindstone is a wheel that grinds on its face. A millstone is a grindstone driven by a mill. Grinding and crushing are not the same action. A pestle can grind or crush.

Thanks everybody - I've edited it and accepted it.