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| Patents for Carl Borngraeber | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 403,956 | May 28, 1889 | L. Metzger, F. Pettge | Bung | |
 | 413,681 | Oct. 29, 1889 | L. Metzger, F. Pettge | Bung | |
 | 485,773 | Nov. 08, 1892 | J.W. von Pittler | Lathe | |
 | 516,286 | Mar. 13, 1894 | L. Wachtler | Pipe Wrench | |