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| All Patents in class 221/175 | |||||
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| Number | Date | Patentee | Title | Type | |
| 445,964 | Feb. 03, 1891 | J.H. Morrison | Spool-lathe feeder | spool or bobbin machines | |
| 479,173 | Jul. 19, 1892 | J.M. Parker | Spool-boring mechanism | drilling and boring | |
| 1,687,134 | Oct. 09, 1928 | J.M. Lynch, W.S. Gilmour | Machine for feeding headed blanks | ||