Keywords: Dorsey measuring device.jpg en Dorsey Method and apparatus for measuring distance 1928-04-24 https //www google com/patents/US1667540 dq Herbert+Grove+Dorsey hl en sa X ved 0ahUKEwiSlPH96p_JAhWCLB4KHaFwCBM4ChDoAQgbMAA US Patent Office other versions PD-USGov Herbert Grove Dorsey U S Patent drawings Uploaded with UploadWizard |