Claims that a German scientist invented the telephone 15 years before Alexander Graham Bell are supported by evidence from newly surfaced archive papers.

Successful tests on a German device manufactured in 1863 were covered up to maintain the Scot’s reputation, the previously unseen files have revealed.

They show the “Telephon”, developed by German research scientist Philipp Reis, could transmit and receive speech.

It is alleged UK businessman Sir Frank Gill was behind the cover-up.

The evidence is contained in files from the archives of the Science Museum in London.

The documents were rediscovered…

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