The Bell Telephone Company, a common law joint stock company, was organized in Boston, Massachusetts, on July 9, 1877, by Alexander Graham Bell's father-in-law Gardiner Greene Hubbard, who also helped organize a sister company – the New England Telephone and Telegraph Company. The Bell Telephone Company was started on the basis of holding "potentially valuable patents", principally Bell's master telephone patent #174465. Upon its inception, the Bell Telephone Company was organized with Hubbard as "trustee", although he was additionally its de facto president, since he also controlled his daughter's shares by power of attorney, and with Thomas Sanders, its principal financial backer, as treasurer.