Special Agents Series, 第 144-154 期U.S. Government Printing Office, 1917 |
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第 1 到 5 筆結果,共 28 筆
第 5 頁
... disk plow , made in England . ...... .. 2. Double - furrow plow , made in Germany .. 3. Double - furrow walking plow , made in Germany . 4. Three - furrow fallowing plow , made in Germany . 5. English disk harrow ......... 6. Chaff ...
... disk plow , made in England . ...... .. 2. Double - furrow plow , made in Germany .. 3. Double - furrow walking plow , made in Germany . 4. Three - furrow fallowing plow , made in Germany . 5. English disk harrow ......... 6. Chaff ...
第 77 頁
... plow bottom . The double - furrow moldboard plow is the type most extensively used for plowing lands for maize . Quite often a disk plow is used for cross plowing , and this is also used by a great number of farmers to the exclusion of ...
... plow bottom . The double - furrow moldboard plow is the type most extensively used for plowing lands for maize . Quite often a disk plow is used for cross plowing , and this is also used by a great number of farmers to the exclusion of ...
第 94 頁
... Disk plows are quite generally used to plow the land before plant- ing , being set to plow at the utmost depth their construction permits . After plowing , trenches 2 or 3 feet deep are made with hand tools . Deep , loose , friable ...
... Disk plows are quite generally used to plow the land before plant- ing , being set to plow at the utmost depth their construction permits . After plowing , trenches 2 or 3 feet deep are made with hand tools . Deep , loose , friable ...
第 98 頁
... harrow , and with a revolving set of spikes in- stead of disks , were used in large numbers to cultivate alfalfa and ... Disk harrows , therefore , have lately been more largely used for that purpose . Any machine or device produced to ...
... harrow , and with a revolving set of spikes in- stead of disks , were used in large numbers to cultivate alfalfa and ... Disk harrows , therefore , have lately been more largely used for that purpose . Any machine or device produced to ...
第 114 頁
... Harrows .. Incubators : Ostrich . Poultry . Mills , wind . Mowers ... Plows : 2 7,850 1,763 1,678 2,122 2,287 Gas ... plows , both disk and moldboard . According to the official customs returns , the value of agricultural implements ...
... Harrows .. Incubators : Ostrich . Poultry . Mills , wind . Mowers ... Plows : 2 7,850 1,763 1,678 2,122 2,287 Gas ... plows , both disk and moldboard . According to the official customs returns , the value of agricultural implements ...
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