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| Patents for Hall Type Writer Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-13,393 | Sep. 13, 1881 | T. Hall | Improvements on type writing machines | typewriters | |
| 336,481 | Feb. 16, 1886 | T. Hall | Type-plate for type-writing machines | typewriters | |
| 453,593 | Jun. 02, 1891 | T. Hall | Type-writing machine | typewriters | |