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| Patents for John M. Barr | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 984,182 | Feb. 14, 1911 | J.M. Barr | Magnetizable wedge for dynamo-electric machines | |
 | CA-254,413 | Oct. 06, 1925 | J.M. Barr | Speed controller | |