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| Patents for Arthur J. Calpha | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,854,445 | Apr. 19, 1932 | A.J. Calpha | Machine Tool | ||
| 1,975,250 | Oct. 02, 1934 | O.L. Craft, A.J. Calpha | Hydraulic Feed Control Apparatus | ||
| 2,266,847 | Dec. 23, 1941 | O.L. Craft, A.J. Calpha | Power Driven Ripsaw | ||