Gardner gun
Gardner gun is a machine gun or multiple-barrel firearm.
Overview
Old Machine gun.
In detail
Gardner gun is a machine gun or multiple-barrel firearm.
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
“Gardner gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q5522623: Gardner gun
Consult the source