Telephone Repairs: Economical And Best Option
Bell and Watson extended to work on the harmonic telegraph at the insistence of Hubbard and added economic backers. During March 1875 Bell achieved with a man called Joseph Carol without the data of Hubbard. Joseph Carol was the respectable director of the Smithsonian Institution تلفن تحت شبکه voip. He listened tightly to Bell’s ideas […]