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All Patents in class 261/DIG.003 | |||||
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Picture | Number | Date | Patentee | Title | |
![]() | 808,897 | Jan. 02, 1906 | W.H. Carrier | Apparatus for treating air | |
![]() | 854,270 | May 21, 1907 | W.H. Carrier | Method of heating and humidifying air |