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| Patents for Charles A. Singer | |||||
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| Number | Date | Patentee | Title | Type | |
| 335,845 | Feb. 09, 1886 | C.A. Singer | Centering-tool | metal lathe accessories and attachments | |
| 344,416 | Jun. 29, 1886 | C.A. Singer | Key-fastener | ||
| 346,133 | Jul. 27, 1886 | C.A. Singer | Universal lathe chuck | metal lathe chucks | |