The Google Patents bibliographic record for US Patent 1,831,331, Apparatus for Automatically Recording Telephonic Messages, Benjamin F. Thornton's telephone answering machine patent filed 7 April 1930 and issued 10 November 1931.
Facts
PublisherGoogle Patents / United States Patent Office
URLhttps://patents.google.com/patent/US1831331A/en
Source TypeReference Work
Reliability Tier1
Sources
Apparatus for Automatically Recording Telephonic Messages Patent US1831331 (Google Patents)
Claims Backed By This Source (7 claims)
This source backs 7 claims across the atlas. As facts: 6 well-attested. Plus 1 entities citing it as a general reference with no single fact or relationship attached.
Disposition By Topic
- Sources, 5 claims: 5 well-attested.
- Inventions, 2 claims: 1 well-attested, 1 general references.
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