How Hugo Gernsback’s weird 1925 invention was designed to dam 95% of sound and induce whole focus amongst employees and inventors

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How Hugo Gernsback’s weird 1925 invention was designed to dam 95% of sound and induce whole focus amongst employees and inventors

The isolator helmet: How Hugo Gernsback’s weird 1925 invention was designed to dam 95% of sound and induce whole focus amongst employees and inventors

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