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Alexander Graham Bell's telephone patent drawing and oath, officially approved March 7, 1876.

Transcript:

...[tes]timony whereof I have hereunto signed [my] name this 20th day of January A.D. 1876

Alexander Graham Bell

Witnesses
Thomas E. Barry
[P. ?. Richards?]

State of Massachusetts
Suffolk County

Alexander Graham Bell -- the above named petitioner being duly sworn deposes and says that he verily believes himself to be the original and first inventor of the improvements in telegraphy described and claimed in the foregoing specification, that he does not know and does not believe that the same was ever before known or used; and that he is a native of Great Britain and has declared his intention of becoming a citizen of the United States.

Alexander Graham Bell

Thomas E. Barry
[P. ?. Richards?] , Witnesses

Sworn to and subscribed before me this 20th day of January, A.D. 1876
Thomas E. Barry, Notary Public