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| Patents for Joseph W. Purman | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,207,934 | Sep. 21, 1965 | R.I. Robinson, B.T. Hein, J.W. Purman | Electric motor with improved cooling means | motor cooling | |
| CA-733,203 | Apr. 26, 1966 | J.W. Purman, B.T. Hein, R.I. Robinson | Electric motor with improved cooling means | motor cooling | |