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| All Patents in class 215/235 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,616,750 | Feb. 08, 1927 | H.L. Johnston | Glass hopper | ||
| 3,120,879 | Feb. 11, 1964 | D.J. Warner | Oil Cup With Integral Spring | oil cups | |