PTM-1
PTM-1 is an anti-tank mine or weapon model.
Also recorded as PGMDM.
Overview
Soviet anti-tank mine.
In detail
It is associated with Soviet Union and Russia.
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
“PTM-1”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q111596721: PTM-1
Consult the source