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| Patents for Keystone Mfg. Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,199,984 | May 07, 1940 | C.C. Chur | Wrench Set Holders | wrench set holders | |
| 2,973,188 | Feb. 28, 1961 | R.R. Howe | Mixing Apparatus | ||