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| All Patents in class 408/50 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,931 | May 04, 1852 | D.H. Thompson | Window-blind machinery | windowblind machines | |
| 10,403 | Jan. 10, 1854 | D.M. Cummings | Machinery for mortising frames of window-blinds | mortising machines | |
| 322,969 | Jul. 28, 1885 | G.T. Reiss | Drilling-machine | multiple spindle drill presses | |
| 708,995 | Sep. 16, 1902 | W.E. Butler | Drilling-Machine | multiple spindle drilling heads | |
| 2,083,023 | Jun. 08, 1937 | W.M. Fairbairn, A.M. Johnson | Machine tool | multiple spindle drill presses | |