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| All Patents in class 56/250 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 635,049 | Oct. 17, 1899 | L. Look | Jar Closer or Opener | |
 | 771,376 | Oct. 04, 1904 | H. Loxterkamp | Flexible Wrench | |
 | 1,383,123 | Jun. 28, 1921 | R.H. Jones | Grease Cup Wrench | |
| 1,444,100 | Feb. 06, 1923 | F.H. Bierman | Lawn-mower-sharpening machine | ||
| 1,866,794 | Jul. 12, 1932 | F.H. Bierman | Lawn mower sharpening machine | ||
 | 2,135,900 | Nov. 08, 1938 | H.W. Kulp | Grinding Tool | |