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1Patent
المؤلفون: Reed, General B., Morgan, James H.
المساهمون: Hall, George B., Spearman, Robert F.
مصطلحات موضوعية: Inventions, Business, Economics and Finance - Transportation - Railroads, railroad frogs, Science and Technology
جغرافية الموضوع: United States - Texas - Hunt County - Greenville
وصف الملف: [1], 2 p. : ill.; 23 cm.; Text
Relation: pat-no: 1247879; govno: 02/172711; https://texashistory.unt.edu/ark:/67531/metapth1256658/; ark: ark:/67531/metapth1256658