Ignoramus2551 fired this volley in
:

I believe that it is mortar master. They make concrete pumps.

Quite possible, though I don't have that nuance in what German I learned.

Like English, Germans tend to use one word for more than one meaning.

It might mean mortar, too.

More interesting, though, is what Germans do when they don't _have_ a
word to describe something. Then they just string other ones together
into a single noun that can be dozens of syllables long! G

LLoyd