Portable posthole digger

作者: Vaughn O Gibbens

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参考文章(7)
Clarence M Cox, One-man posthole digger ,(1947)
Arps Bruno F, Arps Frederick B, Posthole digger attachment for tractors ,(1945)
Harold B Adams, Posthole digger attachment ,(1946)
Robert C Benson, Angle hole digger ,(1947)
Ernest V Bunting, Earth boring attachment for tractors ,(1945)
Dunn John, POST HOLE DIGGER ,(1906)