RM-70
RM-70 is a multiple rocket launcher or artillery model.
Also recorded as RM-70 multiple rocket launcher; vz. 70.
In detail
It is associated with Czechoslovakia.
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
“RM-70 multiple rocket launcher”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q974830: RM-70
Consult the source