Artistic Mystery

Of course I read the comments but if I had to answer from the outset, I would have opted for the closure antieffraction of my home

Ben this is not funny, you have already found. Yes it is a machine to make the gutters, on-site and customized. The longest was 11 m, needless to say, my house it is awfully nice now. Thank you for having sought and found.

I think that this machine is used to shape a metal sheet into a gutter (or rather a chéneau) or a mould to make cornice, reconstituted stone, plaster, or other material... I await the answer with impatience !

Go, I'm starting. The pre-cut looks like a rain gutter. I can imagine that if we take off a section of gutter into the hole, it would be possible to cut it out. This machine looks similar to a shear. The blade obscuring the passage on this photo.

Uh, it's a guillotine ? Frankly no idea. It must be used to cut, the metal (according to the color of the residue is black and there is not a single chip, which drags). The notch should serve as a guide for the shape of the cup. In any case, bravo for the riddle, it's not easy if we do not know. .