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| All Patents in class 134/42 | |||||
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| Number | Date | Patentee | Title | Type | |
| 447,966 | Mar. 10, 1891 | J.H. Mitchell | Process of treating cakes, &c. | baker | |
| 2,095,502 | Oct. 12, 1937 | H.L. Johnston | Cleaning and sterilizing method and apparatus | ||