On December 7, 1880, Alexander Graham Bell patented photophone, which allowed for the transmission of speech on a beam of light. Bell believed the photophone…
On December 6, 1892, W. Kales patented physician’s table. Patent Information Publication number: US487625 A Patent Title: Physician s table Publication type: Grant Publication date:…
Patent Information Publication number: US381969 A Patent Title: Electro-magnetic motor Publication…
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