20×138mmB
20×138mmB is a cannon cartridge or ammunition model.
Also recorded as 20 x 138 mm Belted; Long Solothurn; 20x138mmB; 20 mm L/138; 20 mm Solothurn; 20×138mmB cartridge.
Overview
Ammunition cartridge in caliber 20mm.
In detail
It is associated with Switzerland. The record gives 1930 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
“20×138mmB”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4630843: 20×138mmB
Consult the source