RM-51
RM-51 is a self-propelled artillery or artillery model.
Overview
Type of self-propelled multiple rocket launcher.
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-51”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q7276962: RM-51
Consult the source