TheHerrmann wall telephone, also known as the "privileged phone", was a type oftelephone, created by the Portuguese inventor,Maximiliano Augusto Herrmann, in1880. The pioneering use of buttons to activate the telephone played a fundamental role to the opening of public lines in the main cities ofPortugal.[1] The telephone was composed by a double earpiece, made with long flexible tubes, and a transmitter fixed to main body of the machine.[1]
Its inventor, Maximiliano Augusto Herrmann (1832–1913), worked for the North and East Portuguese Railway Company (Portuguese:Companhia dos Caminhos-de-ferro do Norte e Leste) astelegraph lines inspector. He later opened a workshop inLisbon dedicated to the production of precision instruments.[1]
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