Final answer:
Alexander Graham Bell invented the telephone and significantly contributed to communication technologies, notably for the hearing impaired, and Thomas Edison created an enhanced version. Guglielmo Marconi invented the radio, transmitting the first wireless signal across the Atlantic.
Step-by-step explanation:
The inventor of the telephone and a pioneer in communication for the hearing and hearing-impaired is Alexander Graham Bell. Bell was the first to patent the telephone in 1876, marking a significant contribution to communications technology. His efforts in improving communication for the deaf are also noteworthy. The creation of Bell's National Bell Telephone Company eventually led to the establishment of the American Telephone and Telegraph Company (AT&T), an enterprise still in existence today. It is worth noting that Thomas Edison also played a role by inventing an improved version of the telephone for Western Union, which was later acquired by the Bell Company.
The invention attributed to Guglielmo Marconi is the radio, which he succeeded in using to transmit a wireless signal across the Atlantic Ocean in 1901. This innovation set the stage for the future of broadcasting and communications at sea and across continents.