13.5 cm K 09
13.5 cm K 09 is a field gun or artillery model.
Also recorded as 13.5cm FK 1909.
Overview
Type of heavy field gun.
In detail
It is associated with German Empire.
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
“13.5 cm K 09”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4548971: 13.5 cm K 09
Consult the source