Thomas Edison experimented with cement phonograph cases.  Edison
worked a great deal on Portland cement and prefab houses at one
point.  In one of the Edison books are pictures of a very elaborate
and ornate statue model with an Amberola 30 mechanism inside.

Edison also made a large disc machine that had a cement case.
It seems to me that I read that they had a problem with the lids
cracking and breaking on the experimental models.  Both of these
machines were made in the early 'teens.  I doubt that any production
models were ever made, although it might be interesting to know if
any have survived in the Edison complex in New Jersey.

Randy Hammond