as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
when was the invention of the telephone announced?
user
the first practical telephone was invented by alexander graham bell and patented on march 7, 1876. bell’s patent was officially announced in the united states on march 10, 1876.
assistant