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All Patents of Type: screw extractors | |||||
Number | Date | Patentee | Title | Type | |
1,105,535 | Jul. 28, 1914 | J.O. Roberts | Screw Extractor | screw extractors | |
1,761,156 | Jun. 03, 1930 | F.R. Rosan | Turning Tool Applicable to Remove Refractory Screws | screw extractors | |
1,875,484 | Sep. 06, 1932 | F. Nigra | Screw Extractor | screw extractors | |
2,507,167 | May 09, 1950 | D.R. Lemmerman | Rotary Impact Type Turning Tool | screw extractors |