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| All Patents in class 74/18.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,533,281 | Apr. 14, 1925 | H.E. Tautz | Testing machine | ||
| 1,661,131 | Feb. 28, 1928 | G.B. Duffield | Expansible Collapsible Element | steam engine packing | |
| 2,154,651 | Apr. 18, 1939 | O.P. Wodack, H.M. Zschau | Tool retainer for portable power driven tools | drill chucks | |