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| All Patents in class 138/38 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 329,490 | Nov. 03, 1885 | J.C. Salzgeber | Apparatus for Treating Hot Roasted Coffee | ||
 | 358,430 | Mar. 01, 1887 | M.R. Clapp | Coiled-tube boiler | |
| 1,865,677 | Jul. 05, 1932 | C.C. Cheyney | Sound deadener | ||
| 2,750,628 | Jun. 19, 1956 | W.S. Renier | Heating Unit for Plastic Molding Machines | ||