Union Iron Works
E729160
Union Iron Works was a prominent San Francisco–based shipbuilding company known for constructing major U.S. Navy vessels in the late 19th and early 20th centuries.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Union Iron Works canonical | 5 |
| Union Iron Works site | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8062498 — 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: Union Iron Works Context triple: [USS Macdonough (DD-9), builder, Union Iron Works]
-
A.
Newport News Shipbuilding
Newport News Shipbuilding is a major American shipyard in Virginia renowned for constructing U.S. Navy warships, including battleships, aircraft carriers, and submarines.
-
B.
New York Shipbuilding Corporation
New York Shipbuilding Corporation was a major American shipyard based in Camden, New Jersey, known for constructing numerous U.S. Navy warships in the early to mid-20th century.
-
C.
Bethlehem Shipbuilding Corporation
Bethlehem Shipbuilding Corporation was a major American shipbuilding company, particularly prominent in the early to mid-20th century for constructing numerous naval and commercial vessels.
-
D.
Federal Shipbuilding and Drydock Company
Federal Shipbuilding and Drydock Company was a major American shipyard in Kearny, New Jersey, that built numerous naval vessels, particularly destroyers, for the U.S. Navy during the early to mid-20th century.
-
E.
Ingalls Shipbuilding
Ingalls Shipbuilding is a major American shipyard in Pascagoula, Mississippi, best known for constructing U.S. Navy warships including numerous modern destroyers and amphibious assault ships.
- 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: Union Iron Works Target entity description: Union Iron Works was a prominent San Francisco–based shipbuilding company known for constructing major U.S. Navy vessels in the late 19th and early 20th centuries.
-
A.
Newport News Shipbuilding
Newport News Shipbuilding is a major American shipyard in Virginia renowned for constructing U.S. Navy warships, including battleships, aircraft carriers, and submarines.
-
B.
New York Shipbuilding Corporation
New York Shipbuilding Corporation was a major American shipyard based in Camden, New Jersey, known for constructing numerous U.S. Navy warships in the early to mid-20th century.
-
C.
Bethlehem Shipbuilding Corporation
Bethlehem Shipbuilding Corporation was a major American shipbuilding company, particularly prominent in the early to mid-20th century for constructing numerous naval and commercial vessels.
-
D.
Federal Shipbuilding and Drydock Company
Federal Shipbuilding and Drydock Company was a major American shipyard in Kearny, New Jersey, that built numerous naval vessels, particularly destroyers, for the U.S. Navy during the early to mid-20th century.
-
E.
Ingalls Shipbuilding
Ingalls Shipbuilding is a major American shipyard in Pascagoula, Mississippi, best known for constructing U.S. Navy warships including numerous modern destroyers and amphibious assault ships.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
industrial company
ⓘ
shipbuilding company ⓘ |
| acquiredBy |
Bethlehem Steel
ⓘ
linked to:
Bethlehem Steel Corporation
|
| acquisitionPeriod | early 20th century ⓘ |
| activePeriod |
early 20th century
ⓘ
late 19th century ⓘ |
| associatedWith |
Dogpatch neighborhood of San Francisco
ⓘ
San Francisco waterfront ⓘ
linked to:
San Francisco Embarcadero waterfront
|
| builtFor | United States Navy ⓘ |
| builtVesselType |
battleships
ⓘ
commercial ships ⓘ cruisers ⓘ destroyers ⓘ submarines ⓘ |
| contributedTo |
West Coast maritime industry
ⓘ
industrial development of San Francisco ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| employed |
naval architects
ⓘ
shipfitters ⓘ welders ⓘ |
| hasFacilityType |
iron works
ⓘ
shipyard ⓘ |
| heritage | maritime industrial heritage site ⓘ |
| historicalSignificance |
major West Coast naval shipbuilder
ⓘ
pioneer of large-scale steel shipbuilding on the U.S. West Coast ⓘ |
| industry |
heavy engineering
ⓘ
shipbuilding ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
San Francisco ⓘ San Francisco Bay Area ⓘ |
| locatedOn | San Francisco Bay ⓘ |
| notableFor | construction of U.S. Navy warships ⓘ |
| notableShipBuilt |
USS Charleston (C-2)
ⓘ
linked to:
USS Charleston
USS Olympia (C-6) ⓘ USS Oregon (BB-3) ⓘ
linked to:
USS Oregon
USS San Francisco (C-5) ⓘ USS Wisconsin (BB-9) ⓘ |
| ownedBy |
Bethlehem Steel
ⓘ
linked to:
Bethlehem Steel Corporation
|
| partOf | U.S. naval industrial base ⓘ |
| regionServed |
Pacific Ocean
ⓘ
West Coast of the United States ⓘ |
| roleIn | expansion of the U.S. Pacific Fleet ⓘ |
| servedDuring |
Spanish–American War
ⓘ
World War I ⓘ |
| status | defunct ⓘ |
| successor | Bethlehem Shipbuilding Corporation ⓘ |
| usedPropulsionType | steam propulsion ⓘ |
| usedTechnology | steel-hulled ship construction ⓘ |
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: Union Iron Works Description of subject: Union Iron Works was a prominent San Francisco–based shipbuilding company known for constructing major U.S. Navy vessels in the late 19th and early 20th centuries.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.