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| Keywords: Dorsey sound wave printer.jpg en Dorsey Device for graphically reproducing sound-waves 1912-02-13 https //www google com/patents/US1017392 dq Herbert+Grove+Dorsey hl en sa X ved 0ahUKEwjOjMPwjp_JAhWFax4KHaEiB5UQ6AEIKjAC US Patent Office other versions PD-USGov Herbert Grove Dorsey U S Patent drawings Uploaded with UploadWizard | ||||
