title: Disk-Harrow Sharpener. title: Disk Harrow Sharpener. creator: Lammon, Harry contributor: Cruse, S. G. contributor: Harrell, D. contributor: Wagner, C. H. contributor: Hinkley, G. W. contributor: Columbia Planograph Co. publisher: United States. Patent Office. date: 1913-11-25 language: English description: Patent for improvements to sharpening the disk harrows by attaching a disk sharpener onto the frame of the disk harrow so as the harrow is being drawn across the field, the rotating disk harrow comes into contact with the sharpener. Includes instructions and illustrations. subject: Inventions subject: Harrows subject: Science and Technology subject: Agriculture - Farm Equipment - Plows subject: agricultural equipment coverage: United States - Texas - Liberty County - Cleveland rights: Public Domain type: Patent format: 2 sheets, 3 p. : ill. ; 23 cm. format: Text identifier: pat-no: 1079867 identifier: govno: 02/748394 identifier: https://texashistory.unt.edu./ark:/67531/metapth858390/ identifier: ark: ark:/67531/metapth858390