Language
en
Duration
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Publisher of text edition
Project Gutenberg
Release date
2003-11-01
Rights
Public domain in the USA.
Subjects

1876–1944
An inventive engineer of the early electrical age, he is best remembered for creating the first practical portable hearing aid and for turning bold ideas into everyday devices. His career also crossed paths with Thomas Edison, putting him at the center of some of the era's most exciting technology.
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