Oerlikon 20 mm anti-aircraft cannons
E577859
The Oerlikon 20 mm anti-aircraft cannon is a widely used World War II-era automatic gun renowned for its rapid-fire capability against aircraft and light surface targets on naval vessels and ground installations.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Oerlikon 20 mm cannon | 2 |
| Oerlikon 20 mm anti-aircraft cannons canonical | 1 |
| Oerlikon 20 mm cannons | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6210743 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Oerlikon 20 mm anti-aircraft cannons Context triple: [USS Juneau (CL-52), armament, Oerlikon 20 mm anti-aircraft cannons]
-
A.
Mauser BK-27 27 mm cannon
The Mauser BK-27 is a German-designed 27 mm revolver cannon widely used in modern fighter aircraft for high-rate, accurate air-to-air and air-to-ground fire.
-
B.
40 mm Bofors autocannon
The 40 mm Bofors autocannon is a widely used, rapid-firing anti-aircraft and multi-purpose gun system renowned for its reliability and effectiveness since World War II.
-
C.
37 mm Nudelman N-37 cannon
The 37 mm Nudelman N-37 cannon is a powerful Soviet aircraft autocannon developed in the late 1940s, widely used as a primary heavy armament on early jet fighters and other combat aircraft.
-
D.
MG 213 cannon
The MG 213 cannon was an experimental German 20/30 mm revolver aircraft cannon developed by Mauser during World War II that pioneered the revolver cannon design used in many postwar aircraft guns.
-
E.
Breda-SAFAT machine gun
The Breda-SAFAT machine gun was a standard Italian aircraft-mounted automatic weapon used extensively by the Regia Aeronautica during the interwar period and World War II.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Oerlikon 20 mm anti-aircraft cannons Target entity description: The Oerlikon 20 mm anti-aircraft cannon is a widely used World War II-era automatic gun renowned for its rapid-fire capability against aircraft and light surface targets on naval vessels and ground installations.
-
A.
Mauser BK-27 27 mm cannon
The Mauser BK-27 is a German-designed 27 mm revolver cannon widely used in modern fighter aircraft for high-rate, accurate air-to-air and air-to-ground fire.
-
B.
40 mm Bofors autocannon
The 40 mm Bofors autocannon is a widely used, rapid-firing anti-aircraft and multi-purpose gun system renowned for its reliability and effectiveness since World War II.
-
C.
37 mm Nudelman N-37 cannon
The 37 mm Nudelman N-37 cannon is a powerful Soviet aircraft autocannon developed in the late 1940s, widely used as a primary heavy armament on early jet fighters and other combat aircraft.
-
D.
MG 213 cannon
The MG 213 cannon was an experimental German 20/30 mm revolver aircraft cannon developed by Mauser during World War II that pioneered the revolver cannon design used in many postwar aircraft guns.
-
E.
Breda-SAFAT machine gun
The Breda-SAFAT machine gun was a standard Italian aircraft-mounted automatic weapon used extensively by the Regia Aeronautica during the interwar period and World War II.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
anti-aircraft gun
ⓘ
autocannon ⓘ naval gun ⓘ |
| actionType | automatic ⓘ |
| ammunitionType | 20×110 mm ammunition ⓘ |
| barrelType | air-cooled barrel ⓘ |
| caliber | 20 mm ⓘ |
| countryOfOrigin | Switzerland ⓘ |
| designedFor |
ground-based air defense
ⓘ
shipboard air defense ⓘ |
| developedFrom | 20 mm Becker cannon design ⓘ |
| effectiveAgainst |
low-flying aircraft
ⓘ
small surface craft ⓘ |
| effectiveRange | about 1,000–1,500 meters against aircraft ⓘ |
| era | World War II era NERFINISHED ⓘ |
| feedSystem |
box magazine
ⓘ
drum magazine ⓘ |
| introducedInDecade | 1930s ⓘ |
| manufacturer |
Oerlikon
NERFINISHED
ⓘ
Werkzeugmaschinenfabrik Oerlikon NERFINISHED ⓘ |
| mountingType |
quad mount
ⓘ
single mount ⓘ twin mount ⓘ |
| notableFeature |
high rate of fire
ⓘ
reliability in naval service ⓘ simplicity of design ⓘ |
| operation | blowback ⓘ |
| primaryRole | anti-aircraft warfare ⓘ |
| rateOfFire | approximately 450 rounds per minute ⓘ |
| secondaryRole | anti-surface warfare ⓘ |
| sightType |
optical sight
ⓘ
ring-and-bead sight ⓘ |
| triggerMechanism | hand-operated trigger ⓘ |
| typicalPlatform |
aircraft carrier
ⓘ
battleship ⓘ coastal defense position ⓘ cruiser ⓘ destroyer ⓘ merchant ship ⓘ |
| usedBy |
Imperial Japanese Navy
NERFINISHED
ⓘ
Kriegsmarine NERFINISHED ⓘ Royal Australian Navy NERFINISHED ⓘ Royal Canadian Navy NERFINISHED ⓘ Royal Navy ⓘ United States Army ⓘ United States Navy ⓘ |
| usedInConflict |
Falklands War
NERFINISHED
ⓘ
Korean War NERFINISHED ⓘ World War II ⓘ |
| widelyUsedBy | Allied navies during World War II ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Oerlikon 20 mm anti-aircraft cannons Description of subject: The Oerlikon 20 mm anti-aircraft cannon is a widely used World War II-era automatic gun renowned for its rapid-fire capability against aircraft and light surface targets on naval vessels and ground installations.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Oerlikon 20 mm cannon
this entity surface form:
Oerlikon 20 mm cannon
this entity surface form:
Oerlikon 20 mm cannons