| 摘要 |
377,538. Wood-screws &c. FLESSELLES, W. F., 9, Macdonald Street, Potts Point, near Sydney, Australia. Nov. 16, 1931, No. 31759. [Class 89 (ii).] A central stop is formed across the nick of a screw by displacing some of the metal 10 from each side by the use of a suitable die 11. The screwdriver is made with a corresponding notch 13.
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