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| Patents for Jozua Cornelis Hendrikus Van Duijl | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-189,629,300 | Dec. 21, 1896 | J.C. Van Duijl | Spanners | screw adjust wrenches | |
| 600,813 | Mar. 15, 1898 | J.C. Van Duijl | Adjustable Spanner or Wrench | screw adjust wrenches | |
| GB-190,718,926 | Jan. 09, 1908 | J.C. Van Duijl | Improvements in Screw Spanners or Wrenches | screw adjust wrenches | |