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| Patents for Prince Tool & Die Lab. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,974,417 | Mar. 14, 1961 | J.F. Prince | Precision Measuring Instrument | precision squares | |
| 3,153,354 | Oct. 20, 1964 | J.F. Prince | Adjustable Tool Head Attachment | ||