Ameritech
E182636
Ameritech was a regional telecommunications company formed after the breakup of AT&T’s Bell System, serving the Midwestern United States with local and long-distance phone services.
All labels observed (6)
| Label | Occurrences |
|---|---|
| Ameritech canonical | 10 |
| Ameritech Corporation | 5 |
| Ameritech Mobile Communications | 2 |
| Ameritech Indiana | 1 |
| Ameritech Publishing | 1 |
| Wisconsin Bell | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1565742 — 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: Ameritech Context triple: [Bell System, successor, Ameritech]
-
A.
BellSouth
BellSouth was a major American telecommunications company, formerly one of the regional "Baby Bells" created after the breakup of AT&T, providing telephone and related services across the southeastern United States.
-
B.
Southwestern Bell
Southwestern Bell was a major regional telephone company in the United States that later became part of AT&T through mergers and rebranding.
-
C.
AT&T
AT&T is a major American telecommunications conglomerate known for providing wireless, internet, and media services nationwide.
-
D.
NYNEX
NYNEX was a regional Bell operating company that provided telecommunications services in the northeastern United States following the breakup of AT&T.
-
E.
Southern Telecom
Southern Telecom is a telecommunications subsidiary of Southern Company that provides fiber-optic network and related communication services.
- 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: Ameritech Target entity description: Ameritech was a regional telecommunications company formed after the breakup of AT&T’s Bell System, serving the Midwestern United States with local and long-distance phone services.
-
A.
BellSouth
BellSouth was a major American telecommunications company, formerly one of the regional "Baby Bells" created after the breakup of AT&T, providing telephone and related services across the southeastern United States.
-
B.
Southwestern Bell
Southwestern Bell was a major regional telephone company in the United States that later became part of AT&T through mergers and rebranding.
-
C.
AT&T
AT&T is a major American telecommunications conglomerate known for providing wireless, internet, and media services nationwide.
-
D.
NYNEX
NYNEX was a regional Bell operating company that provided telecommunications services in the northeastern United States following the breakup of AT&T.
-
E.
Southern Telecom
Southern Telecom is a telecommunications subsidiary of Southern Company that provides fiber-optic network and related communication services.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
Baby Bell
ⓘ
Former AT&T subsidiary ⓘ Regional telecommunications company ⓘ |
| acquiredBy | SBC Communications ⓘ |
| alsoKnownAs | American Information Technologies Corporation ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| dateFounded | 1984 ⓘ |
| dateOfAcquisition | 1999 ⓘ |
| fate | Merged into SBC Communications ⓘ |
| formedFrom |
Bell System divestiture
ⓘ
linked to:
United States v. AT&T
|
| headquartersLocation |
Chicago, Illinois
ⓘ
linked to:
Chicago, Illinois, United States
|
| historicalRole | One of the seven original Regional Bell Operating Companies created after the AT&T breakup ⓘ |
| industry | Telecommunications ⓘ |
| operatedBrand |
Illinois Bell
ⓘ
linked to:
Bell Operating Companies
Indiana Bell ⓘ Michigan Bell ⓘ Ohio Bell ⓘ Wisconsin Bell ⓘ
linked to:
Ameritech
|
| ownedSubsidiary |
Ameritech Mobile Communications
ⓘ
linked to:
Ameritech
Ameritech Publishing ⓘ
linked to:
Ameritech
|
| parentCompany |
AT&T (before 1984 breakup)
ⓘ
linked to:
American Telephone and Telegraph Company
|
| partOf | Regional Bell Operating Companies ⓘ |
| providedInfrastructure | Public switched telephone network in its region ⓘ |
| providedServiceTo |
Business customers
ⓘ
Residential customers ⓘ |
| reasonForDissolution | Acquisition and integration into SBC Communications ⓘ |
| regulator |
Federal Communications Commission
ⓘ
State public utility commissions in its service area ⓘ |
| servedRegion | Midwestern United States ⓘ |
| servedState |
Illinois
ⓘ
Indiana ⓘ Michigan ⓘ Ohio ⓘ Wisconsin ⓘ |
| service |
Data services
ⓘ
Directory publishing ⓘ Local telephone service ⓘ Long-distance telephone service ⓘ Wireless telephone service ⓘ |
| status | Defunct as an independent company ⓘ |
| stockExchange | New York Stock Exchange ⓘ |
| successor |
AT&T Inc.
ⓘ
linked to:
AT&T
SBC Ameritech ⓘ
linked to:
SBC Communications
|
| telephoneArea | Great Lakes region ⓘ |
| tickerSymbol | AIT ⓘ |
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: Ameritech Description of subject: Ameritech was a regional telecommunications company formed after the breakup of AT&T’s Bell System, serving the Midwestern United States with local and long-distance phone services.
Referenced by (20)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Ameritech
linked to: Ameritech
linked to: Ameritech
linked to: Ameritech
linked to: Ameritech
subject linked to:
AIT
linked to: Ameritech
linked to: Ameritech
linked to: Ameritech
linked to: Ameritech