3.7 cm Flak 18/36/37/43
3.7 cm Flak 18/36/37/43 is an anti-aircraft gun or autocannon.
Overview
Anti-aircraft warfare.
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
“3.7 cm Flak 18/36/37”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q694878: 3.7 cm Flak 18/36/37/43
Consult the source