Wurfrahmen 40
Wurfrahmen 40 is a multiple rocket launcher or artillery model.
In detail
It is associated with Nazi Germany.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Wurfrahmen 40”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q313420: Wurfrahmen 40
Consult the source