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| All Patents in class 336/133 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,428,234 | Sep. 30, 1947 | A.G. Mapp | Internal Micrometer | micrometers | |
| 2,572,455 | Oct. 23, 1951 | U.S. Dunn | Transformer for arc welding | welding machines | |