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| Patents for Ewald A. Arp | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,868,440 | Jul. 19, 1932 | E.A. Arp | Boring machine and method | |
 | 1,881,993 | Oct. 11, 1932 | E.A. Arp | Tool attachment device | |
 | 1,906,241 | May 02, 1933 | E.A. Arp | Method and apparatus for predetermining the size of rebored cylinders | |
 | RE18,832 | May 16, 1933 | E.A. Arp | Tool attachment device | |
 | 1,954,034 | Apr. 10, 1934 | E.A. Arp | Equalizing boring guide | |