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All Patents in class 81/449 | |||||
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Picture | Number | Date | Patentee | Title | |
![]() | 1,781,470 | Nov. 11, 1930 | E. Mueller | Screw holding screwdriver | |
![]() | 2,150,184 | Mar. 14, 1939 | G.F. Pearson | Screw holding screwdriver |