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Thomas Edison

Currency:USD Category:Collectibles / Autographs Start Price:NA Estimated At:400.00 - 600.00 USD
Thomas Edison

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Auction Date:2019 Dec 04 @ 18:00 (UTC-5 : EST/CDT)
Location:15th Floor WeWork, Boston, Massachusetts, 02108, United States
ALS - Autograph Letter Signed
ANS - Autograph Note Signed
AQS - Autograph Quotation Signed
AMQS - Autograph Musical Quotation Signed
DS - Document Signed
FDC - First Day Cover
Inscribed - “Personalized”
ISP - Inscribed Signed Photograph
LS - Letter Signed
SP - Signed Photograph
TLS - Typed Letter Signed
Examiner's copy of Thomas Edison's early patent for an "Improvement in Speaking-Telephones," no. 208,299, two pages, 7.25 x 11, patented on September 24, 1878. The text features Edison's name printed at the conclusion, and the reverse of the first page features a printed diagram with numerous ink insertions in another hand explaining Edison's improvement. In very good to fine condition, with light soiling, and tack and staple holes to the bottom edge. Accompanied by a copy of a 1991 letter to the consignor from the US Patent Office, allowing this to remain in his possession as it "was part of an abolished classification and may have been obtained through legitimate channels."

While Alexander Graham Bell is credited with inventing the telephone, it was largely Edison who invented a workable carbon grain 'transmitter' (i.e. microphone) that made the telephone commercially viable. The carbon microphone remained standard in telephony until the 1980s, and is still being produced.