BM-24
BM-24 is a multiple rocket launcher or artillery model.
Also recorded as 240 mm rocket launcher BM-24; BM24.
Overview
Multiple rocket launcher family of Soviet origin.
In detail
It is associated with Soviet Union.
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
“BM-24”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q305529: BM-24
Consult the source