print. etching. Alexander Graham Bell 1847-1922 / A Delzers ; from copyright photograph by Harris & Ewing Washington DC. - n.d. [1955-1964] [Men in telecommunications] International Telecommunication Union 23x19cm. -Portrait. HL to L. Alexander Graham Bell 1847-1922, devised apparatus for transmitting sound by electricity, the telephone, invented photophone- transmission of sound on a beam of light- a precursor of today's optical fiber systems, medical researcher, invented techniques for teaching speech to the deaf.