Madsen 20 mm anti-aircraft cannon
Madsen 20 mm anti-aircraft cannon is an autocannon or artillery model.
Also recorded as Madsen 20 mm AA gun; 20 mm AA Machine Cannon M/38.
Overview
Type of autocannon.
In detail
It is associated with Denmark. The record gives 1926 as its date of establishment or first appearance.
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
“Madsen 20 mm cannon”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4994130: Madsen 20 mm anti-aircraft cannon
Consult the source