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| All Patents in class 72/204 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,561,803 | Nov. 17, 1925 | H.C. Smith | Strip-Straightening Attachment For Rotary Shears | metal shearing machines | |
| 2,991,673 | Jul. 11, 1961 | A.F. van Rooij | Device for grooving superfinished steel shafts | metal lathe accessories and attachments | |